these PLASTIC coins were in the reject tray, could they really have gone through the machine?
Yes. I have accidently put shirt buttons into a coinstar machine. Grandkids like sticking random objects into my coin jar apparently.
It's obvious to me from your post that they did.
I have found plastic coins like your plastic Lincoln coin also.
I have found play money in BWR several times.
Send them to our host, should grade at least ms65
Yep... Some strange stuff turns up in the reject slot from time to time.... Once I got a wooden 'coin' .... Lots of foreign coins all the time. Cheers, RickO