Shawn,
Whenever convenient, could you post a pic of the 252001 broadcast? It could help us various spotters that now have your broadcast (and block) on our radar. It is, by no means, a given that your sheet wound up in 252001, but it is a starting point and would offer other clues to watch for. Whatever VIN it probably did go into would (very likely) have been a Coronet R/T or Coronet 500 (the 2 models offered in convertible) because of the stitching pattern, and very unlikely that it would have been in a Satellite, Sport Satellite or GTX (again - B-bodies offered as convertible; these convertible seats wouldn't have fit any A- or C-body) for the same reason. The car it went into would likely have a white interior, but there are stories of people finding a "Friday stack" of multiple broadcasts stuffed in a single car (presumably from someone in the upholstery shop just "tidying up"!) so as with most thing Mopar, nothing is certain.
Also - have you (or anyone else) checked in the backs of the bucket seats for broadcast sheet(s)? The backs are pretty easy to (carefully and correctly) pop off and a many have been found to have sheets in them.
Pretty much all of us would want to see the original block/broadcast(s) reunited with this car. And MOST of us would do so without 'holding the items for ransom'....
Thanks
Mark