Scratch--Obverse detailes

When I started my raw Washington Quarter set, I bought only BU coins. I paid a retail price for most of them. As I completed the set I decided to grade the keys. The Lions share of the Keys were graded Unc-details obverse scratch. Though I contributed to this problem I was upset at the number of Ebayers that did not disclose this. I am wiser now. I speculate the scratches on most came when removing the quarter from the 2x2 and dragging it against the staple. Are there any other thoughts on this?

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