You could go to your paypal account, enter a date range (January 1, 2012 - December 31, 2012) and then select payment received. Of course that will only show your paypal transactions. That will not include any cash payments you may have received.
I thought the seller's invoice would reveal more information but I was surprised to see that I couldn't check my 2012 invoice either. I thought for sure that I could or at least I used to be able to.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.