i still have my NES box + instructions from 1987.
I have that AND a working Intellivision with about 30 games in their original boxes. Anybody want a 512K original Mac, Apple IIe or Atari 2600, make me an offer, but that Intelivision is NOT for sale! I wondered for a long time where I got my tech packrat habit from from until I realized my old man has at least a dozen working 8-track players (including an in-dash player) with well over 100 cassettes. For Xmas he asked for a USB turntable to digitize our record collection (somewhere around 12K) because he misses the crackling and the pops. Live at Leeds, BTW, much better on vinyl.
I used to keep my ticket stubs and still have a pretty big collection from the 80s and 90s back at my folks house, but after I started moving around a lot I stopped keeping them. Why I think someday when I have a kid he's gonna think its cool that his old man paid $10 to see Eve's Plum at the Wiltern I'll never know...