You found three stampings which is an awesome find... May be a tough sale as some folks would weld into a machine no doubt and may even try to pass as an original...
Lots of fantasy machines out there as you know... And not everyone is as honest as they should be... lots of "Found" Crush, Hires and Nesbitt's 81s out there... So folks
will be skeptical and leery when it comes to barn finds...
I will share that one of my first jobs out of high school was working at a Die Casting Company... good old St. Clair Die Cast Co. long gone now... the guys in the die department
were always testing/stamping out to be sure edges were right and that the die/molds didn't tear the metal and/or that the metal wouldn't get stuck in the press when compressed...
I'm sure there could/would be someone that kept the samples in the shop to compare later stamping to check for wear on the dies... then end up being kept instead of being thrown out...
our shop was full of old test junk like that. And there were guys there that were skilled on those old lathes and Bridgeports that no doubt could reproduce these stampings...
These three pieces have a place in collecting I think it would be cool to see them framed as they were found. Again great find and story...just what do you do with them as
everyone will have an opinion. You could probably get some pretty good money for them... then off they go into the soda machine world and where they end up?