Don't forget those anoraks that sell loads going back 40 years+ at autojumbles. I have seen Mk1 Cavalier brochures going for as much as a Tenner!
I have the
brochure and the accessories catalogue for it as well as the receipts, even for every drop of fuel thats gone in. (Plus i wrote down the trip comp stats on the back of every one and still do). Seriously sad - I need a life...