Oh man that reminded me of the endless wrap-up of Dad's estate. His last couple of years, he had a caregiver living in the ranch granny cabin. Years later I backhoed out a dead cherry tree next to the cabin, and uncovered a soggy stash of a small photo album and documents, including a letter: 'Honey I'm sorry I haven't written you for several years and have forgotten when your birthday is but I decided I want to get back together after I finally get paroled. It will only be a few more years'.
She had never talked about her personal life and I had no idea what to do with the stuff. I finally put it in an Express Mail envelope with no addresses, and that into a mall mailbox. Presumably the dead letter branch of the PO could address it to her based on the contents. Either keeping it or destroying it just seemed too weird.
Life can be stranger than fiction!