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Source: https://writers.stackexchange.com/a/33344
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Source: https://writers.stackexchange.com/a/33344
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

If you trust safety deposit boxes to last for decades when paid in advance, then arrange this service with the bank.

Hire a long established law firm (or two, for safety), that agree to a contract to perform this service for you in 10+ years.

Pay for a safety deposit box in advance 10+ years; with notification of additional fees due sent to an office in the law firm you hired. Typically you can list yourself as a co-owner, my wife and I are both signers for our safety deposit box.

Ensure the law firm can access it with just proof of their identity as one of the owners. Put your paid contract with them inside the safety deposit box, along with any items to be delivered.

The bank will not let your box just sit there without payment, they will notify the owner at the address given that rent is coming due (the law firm). The law firm will not just ignore the notice, they will investigate, know your name as co-owner, open the box, and find your contract. Even if they inadvertently destroyed theirs or lost it in a fire or move, yours should suffice, for such a small service, they will likely execute it. You could include cash or gold to cover any additional expenses they might encounter, such as discovering the proper recipient. Law firms are not in the business of ripping off clients, even if it is easy, they won't risk a scandal, and they have no idea if you are alive and could prove they violated their contract.

If you did this with TWO law firms, you increase the odds of success, and it certainly would not damage anything if the recipient received two (or more) copies of the same key, or same message.

Original score: 6