Found mine under the rear seat assembly last winter, after looking in there many times before over the years:
Finding it truly brought a sense of OWNERSHIP to me. That poor piece of paper had waited for someone to rescue it from the cars bowels for almost 38 years, and it was me that brought it back into the light of day.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?