I have a lockup with stuff in them - phone,spare passport, money clothes, washbag, towels, shoes, details of contacts etc.
I leave a letter with the concierge at a club I visit regularly add a last seen by date on it. If it's more than say 6 months old a trusted buddy (or delegates) will open, follow wishes , dispose, use the money as required then go to the pub and play the last post on his phone and place a notice in the London Gazette. If you don't know, look up the origins of the Gazette on Wikipedia.