I'd give it a few more days. His feedback as a seller is only 31 (out of 501 total feedback) so he's mostly a buyer. Just a casual seller probably. If he did mail on Saturday, it may not have left the post office in Deadwood until Monday (2 days ago). Mail for Deadwood SD to you may take till next Saturday or so, depending on your location and how he's sending it.

I wouldn't worry yet. He wouldn't have 100% positive feedback if he's been flaky to his counterparts on ebay.