Maybe I'm missing something

Ok, so I'll admit Im new to the numismatic world....so with that being said I'll ask this... I am currently buying rolls of Presidential dollars. The ones I have been getting from the bank were wrapped by N. F. STRING & SON, INC out of PA. I ASSUMED (we know what that gets us) that these coins were P mint since they came out of PA....Duh... well in looking to purchase some D mint rolls I notice that they are wrapped by the same company. Now the rolls look the same, as far as I can tell, so how would one distinguish P from D mint without opening to check the edge for the mint? Like I said, maybe I am missing something or maybe its the newbie in me.... Anyone with suggestions, ideas, or "Hey stupid...duhs's" let me know!! Thanks.Todd
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However, I usually pick up 4 rolls from my local bank, and I open 1 or 2 rolls to check. If the rolls I open are D mint, I am assuming that the other rolls are also D mint rolls. Of course, I live in MN where all of our roll coins I have received are D mints. So I am pretty safe assuming that the rolls are D mints, once I check a few rolls.
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