The situation
The hard part is knowing what to look for.
Institutions will talk to an executor eventually, with the right paperwork. What they will not do is tell them about accounts they do not know exist.
So the work becomes archaeology: opening post, reading statements, hoping nothing subscription-shaped is quietly draining an account nobody found.
A card and a short note turn that into an afternoon. Not because the card grants any authority, but because it removes the guessing.
What to leave
Three things, together.
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I
The card
The entries themselves, in your handwriting so to speak.
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II
The note
Plain words: what this is, what to do first, who to call.
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III
The password
Held by a person or a professional you trust, separately from the card.
Leave a list,
not a mystery.