Here's a flyer for Electronics Boutique's (now part of GameStop) fledgling trade-in scheme, which not only warns you that the program could end at any time (oh no!), but demands you bring the instructions in. No manual, no trade-in.
Compared to the "sure we'll take any old piece of shit" policy the company has now, those were some strict rules.
[ Retro Scan of the Week ] Electronics Boutique Flyer [VC&G]