It would have been best NOT to purchase from that seller.
Have you checked his reputation (feedback) prior to buying?
http://feedback.ebay.ca/ws/eBayISAPI.dll?ViewFeedback2&userid=northern-hammond&&_trksid=p2047675.l25...
Since the PayPal account he gave in his listing is not active, do not worry about it. Your reputation will not be affected.
In future, always take a look at the seller's feedback BEFORE buying or bidding.