Buff, we've been in the same position. We will be checking the half bag when they open the machine to change the nickel or dime bags for us & we'll ask if we can switch out some of our halves for ones in the bag since it's the exact same denomination coin & we'll tell them we see some in the bag we need for our collection. Sometimes some of the tellers will let us & sometimes they won't. The last post I posted about having to walk away from silver was when we dumped at td & saw some silver halves...almost positive they were 90%ers....& they wouldn't let us trade. I was very sad.