the obvious twist is either "its not where Dr. Brains said it would be..." (and then they find it about 3m to the left), or "hold on... this is a 1934 penny... where's the original?",(reply>), i agree! unequivocally right,(reply>), @Pat The Plant you make a good point,(reply>), @Martin Owens Also gives the chance for the dumb character on the heist team to say "Well, it's older, it must be worth even more, right?",(reply>), I was thinking that the twist would be that the coin collection was under the sign that was shown at the end of this video.  The only long lingering shot of specific small part of the building.,(reply>), @Anton Helsgaun I believe someone capable of swapping them would think of using a 1932 penny to avert suspicion. Unless they want to get famous for it, of course.