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Is it pending on your paypal account OR the sellers paypal account OR both paypal accounts?
If its not showing on the sellers account then it could be another reason.
Is there a clearance date on your paypal account at all?
Think the issue is that the seller has an old or incorrect email address on his ebay auction if its showing as unclaimed.
TELL YOUR SELLER TO DO THIS AND THEN COME HERE TO SORT IT.
Go to ebay and click on 'sell' put in anything (as you aren't going to actually list anything) until you get to the main page > scroll down near the bottom and where it says payment methods check the email address that is on that page, is there a spelling mistake or old one?