Missing a warranty registration card does not automatically mean that your smart lock has no warranty coverage. The FTC says a full warranty cannot require return of a registration card as a condition of coverage, while its guidance gives an example of a limited warranty with a disclosed registration requirement. Read the warranty that applies to your purchase before deciding that a missed form cancels your rights. Product registration, proof of purchase and setting up an app account are different questions; completing one does not establish what the others require.
The current Lockin US warranty page should be read for its actual conditions rather than supplemented with a registration rule from another market. The page checked for this article says its basic warranty starts at product activation and excludes purchases without valid proof of purchase, but it does not state a separate registration-card deadline. That is a description of the published page, not proof that every document supplied with every purchase is identical. If the activation date or applicable terms are unclear for your unit, ask support to identify the relevant record and written condition.
Keeping a purchase record is still useful even when returning a registration card is not required. Preserve the seller’s invoice or order confirmation, the exact item purchased and the warranty text supplied with it. Those records answer when and from whom you bought the lock; an app account by itself may not answer those purchase questions. If a form asks for information, identify whether it is establishing a purchase record, requesting optional marketing details or imposing a stated coverage condition before assuming every field is necessary to obtain service.
A refusal based on missing registration needs a specific written explanation before you accept it as the final answer. Ask which warranty clause applies, whether the provider is referring to a full or limited warranty, and what evidence it will accept for your purchase. Keep the reply with the original terms rather than replacing the original record with a newer webpage. If the dispute remains unresolved, consult an appropriate consumer-protection office about those facts; this guide does not decide an individual claim or promise a repair, refund or exception to an otherwise applicable exclusion.