Replacement Sentry keys can be purchased through SentrySafe.com and EasyKeys.com. SentrySafe.com requires customers to submit the safe's model, serial and lock number, along with a notarized statement of ownership through the website's key replacement submission form.
SentrySafe.com provides customer assistance in locating model and serial information on Sentry chests and files, as well as personal, security, gun and commercial safes. SentrySafe.com does not process replacement key orders until the notarized statement of ownership has been emailed, faxed or mailed in.
EasyKeys.com specializes in Sentry Safe replacement keys for many different safe models such as 3A2, S01 and T51. All of the keys are priced at around $7 as of June 2015. Replacement key purchases do not require a notarized statement of ownership.