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Personally I think these rolls and bags being sold from the mint are a rip-off. Your just paying for the packaging. I cannot justify paying $8.50 for 2 rolls of 2009 cents or $32.95 for 2 rolls of quarters. The packaging means nothing to me.

That's why I never buy rolls or bags from the mint. Why pay more when the bank should have them at face?
At any rate, if you already paid for the packaging, you should keep it intact. And I agree with wets: if you open them, they just become common cents you can find in circulation. If you really want to look for errors and the whole can, ask your bank for rolls at face.