There have been surprises. Take TropicalCat's LA built plum crazy R/T. (Hi TC!) Broadcast sheet was found under the right passenger seat glued onto the floor. Hopefully you'll have good results once you go through every single nook and cranny.
I find it hard to believe 7 people looked at the car and no one has grabbed it yet. It's a R/T! Check for any hidden damage that the owner might not be disclosing, bring your magnets handy for checking bondo! Check the front and rear end frame rails as well for any "repairs" done in the past. Keep us posted how it goes. Offer $8,500-9k cash, he might just take it!
My LA built 70 RT/SE has a pritine build sheet.