What is the safest physical to store a private key only to be accessed after death?

Assume that my friend would like to encrypt his Bitcoin private key(s) and safely store them in a secret location. This located would only be identified to heirs after death in his will. Should he put the key:

  • In a safety deposit box
  • Buried in a weatherrpoof container somewhere on my property?
  • In the possession of my attorney?
  • Somewhere else

Please answer the same question above for my encryption key which I would of course store separately.

As an alternative would a mult-sig solution be helpful? If so how would you design it?

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