Odd Small Dollar Find - Why / How?

I get a roll or two of dollar coins and halves for my cash drawer at my store each week and search the halves for silver. The only thing I usually look for in the dollars is near date 79 SBA's and 81 SBA's, so on the dollars I will usually just look quickly at the edge before dumping them in the drawer. This week's roll had two non-SBA coins whose edge looked slightly different. The edge inscription looked sharper, but I noticed a distinct raised line on these two. Pulled them out and, yep, they had three equally spaced raised lines on the edges. Got out my loupe (my eyes aren't what they once were) to confirm, and yes, two 2007 S dollars in this roll. Now for the strange part - not only were they as well worn as small dollars get, that is, discolored, flat looking fields, wear on the portraits hair, etc., but both were the same - both John Adams.
If someone stole a proof set and broke it up I would expect two different Presidents. I can come up with no reasonable scenario for finding two of the same impaired proofs in the same roll.
Any ideas?

Also, what to do with them. I have a hard time spending proof coins, even though these are highly impaired.