Hi,
Two dollar bills are quite common and generally not worth more then face value. Right now you might get a buyer to pay a few dollars more then face value since they are in order but this would be harder to fine. You would need to contact collectors and go from there.
As with anything with time things become more valuable and with currency you never know which way it will go. Since they were left to you and the value at this point is not high I would consider keeping them to see how time will change the value.
Walter
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