Definition
A lost instrument is a written legal document — such as a deed, promissory note, contract, bond, will, or negotiable instrument — that has been shown to have once existed but cannot be produced because it has been destroyed, misplaced, or otherwise rendered unavailable through no fault of the party seeking to enforce it. The law recognizes that the physical absence of an instrument does not necessarily extinguish the rights it created or evidenced. Courts have developed procedural mechanisms and evidentiary rules that allow a party to establish the contents and legal effect of a lost instrument through secondary evidence, and in some contexts to compel or obtain formal relief based on that secondary proof.
The term covers two overlapping but distinct legal situations:
1. LOST INSTRUMENTS AS AN EVIDENTIARY MATTER: When a party must prove the contents of a document that cannot be produced, the best evidence rule ordinarily requires production of the original. Loss excepts a party from that requirement, provided they first establish the instrument's prior existence, its loss (as distinguished from deliberate destruction or concealment), and lay a proper foundation through testimony or other secondary evidence before the contents may be proved by parol or other means.
2. LOST INSTRUMENTS AS A GROUND FOR EQUITABLE RELIEF: Courts of equity have long entertained bills or actions specifically to establish lost instruments — particularly deeds, notes, and bonds — and to restore their legal effect. A court may order enforcement of the underlying obligation, compel re-execution, or grant other relief on the basis of satisfactory proof of the instrument's former existence and terms. For negotiable instruments, special rules apply because of the risk that the original may surface in the hands of a holder in due course, and courts typically require the plaintiff to post an indemnity bond as a condition of relief.
Common Confusion
LOST vs. MISLAID vs. DESTROYED: In property law, the distinction between lost, mislaid, and abandoned property carries significant legal consequences for finders and owners. In the instruments context, however, "lost" is used broadly to mean "unavailable for production," and courts often treat destroyed instruments under the same evidentiary framework as genuinely lost ones. The critical distinction is not lost-versus-destroyed but rather involuntary unavailability versus deliberate suppression: a party who intentionally destroyed an instrument is not ordinarily entitled to the same relief.
LOST INSTRUMENT vs. LOST OR NOT LOST (INSURANCE): In maritime insurance, "lost or not lost" is a distinct term of art appearing in policy language — it does not describe a missing document but rather a coverage clause making the underwriter liable even if the insured vessel was already lost at the time the policy was written (provided the insured had no knowledge of the loss). Researchers should not conflate this phrase with the law of lost instruments generally. See HISTORICAL DICTIONARY SUPPORT below.
Core Elements
To obtain relief or admission of secondary evidence based on a lost instrument, a party typically must establish:
1. PRIOR EXISTENCE: The instrument actually existed and was duly executed. Testimony of parties, witnesses, or anyone with knowledge of the document ordinarily suffices.
2. LOSS OR UNAVAILABILITY: The instrument is genuinely unavailable — not in the party's possession or control, not capable of being produced after diligent search. Deliberate destruction by the proponent defeats this element; destruction by a third party or natural cause generally does not.
3. CONTENTS: The terms of the lost instrument must be proved with reasonable certainty. Parol evidence, copies, drafts, correspondence, or witness recollection may all be used once the foundation is laid.
4. INDEMNITY (negotiable instruments): Where the lost instrument is negotiable and could create liability to a future holder in due course, courts will typically require adequate security or indemnity before ordering enforcement.
Why It Matters in Research
Researchers in the Law Mind corpus should be alert to several complicating features of this topic:
EVIDENTIARY LAW vs. EQUITY OVERLAP: Older sources often treat lost instruments primarily as an equity matter (a formal bill in chancery to establish a lost deed or bond) while modern treatment is split between the law of evidence (best evidence / original writing rule) and substantive statutory schemes for lost negotiable instruments. These threads run in parallel and are often treated separately in historical sources, making cross-corpus searching essential.
NEGOTIABLE INSTRUMENTS STATUTES: The Uniform Commercial Code (Article 3) has largely displaced common law and equity practice for lost, destroyed, or stolen negotiable instruments in American jurisdictions. Researchers working with pre-UCC materials or non-UCC instruments (deeds, non-negotiable contracts) must be careful not to import modern statutory standards into historical analysis.
BEST EVIDENCE RULE EVOLUTION: The "best evidence" or "original writing" rule has changed substantially. In older practice, laying the foundation for a lost instrument was a more formal and demanding process. Modern rules (Federal Rules of Evidence Rule 1004, and state analogs) are considerably more permissive. Historical cases applying strict foundation requirements should not be read as current law without verification.
INDEMNITY BOND REQUIREMENT: The requirement to post security before enforcing a lost negotiable instrument is a research trap — courts in equity imposed it by discretion, but modern statutes often codify it with specific standards. A researcher finding historical cases about indemnity in lost-instrument suits should check whether a statutory scheme has since preempted the common law rule in the relevant jurisdiction.
Historical Dictionary Support
Rapalje & Lawrence do not provide a freestanding entry for LOST INSTRUMENTS as such. The source material directs researchers to cross-references under ACCIDENT and EVIDENCE, which reflects the traditional understanding that the law of lost instruments was procedurally housed in equity (for relief) and in evidence doctrine (for proof). This is consistent with how older practice manuals organized the topic: the right to enforce a lost instrument was treated as an equitable remedy, not a standalone substantive right.
The Rapalje & Lawrence material reproduced here under this heading actually concerns LOST OR NOT LOST — the maritime insurance term — which is a separate topic. That phrase, appearing in a hull or cargo policy, operates to extend coverage retroactively to a subject matter already lost at inception, provided the insured was in good faith. It has nothing to do with missing documents. The historical dictionary's physical placement of this entry near "lost instruments" cross-references is a source layout artifact, not a doctrinal connection.
The absence of a dedicated Rapalje & Lawrence entry for lost instruments as documents likely reflects that the topic was treated extensively in equity practice treatises and evidence treatises of the period rather than in law dictionaries, which typically focused on terms of art rather than procedural doctrines. Researchers should consult period equity practice materials and evidence treatises for fuller historical treatment.
Jurisdictional Note
American jurisdictions have largely adopted UCC Article 3 for lost or stolen negotiable instruments, but the common law and equity framework remains operative for non-negotiable instruments (deeds, contracts, bonds). English and Commonwealth sources remain relevant for pre-twentieth-century doctrine but diverge significantly from American statutory practice in the modern period.
Encyclopedia Cross-Reference
Law Mind Property Law Encyclopedia: Personal Property — Acquisition by Find (Lost, Mislaid, Abandoned, Treasure Trove) [property_132] — covers the property law treatment of lost personal property; useful for understanding the lost/mislaid/abandoned distinction that sometimes appears in instrument cases by analogy.