I love that people properly document important stuff like that. My grandma died last year aged 94 or so, and in her inheritance was a load of stuff that she wrote tiny notes on. I've got a plastic ibex head with a barometer on my wall now from the 60's or whatever with a tiny handwritten note taped to the back when and where it was bought. I mean it's worthless in both collectability and sentimental value, but the little note gives it a bit more personality.
I should do the same with anything I think is collectible / not trash / may end up in someone else's hands. For example, I bought some LPs over time, I should document when and where I bought them from at least. Maybe print out some information about the band / artist and include it, as the music themself is only part of the "product".