Easy fix - have Walter (under his eBay ID) email the seller and explain things too. As you've paid by money order, there's no Paypal/confirmed address issues.
In my ePay side business, I see this often - some dude (not an idiot - you're too tough on yourself) will bid on my stuff without checking the ID that's logged in, and suddenly "Puff-luvs-kats" (his girlfriend) wins a piece of gear. They explain, I ship, and all is well with this side of the universe.
BTW - only tonight, I sniped myself! I mistakenly bid earlier using my seller ID, and then eSnipe sniped for me under my bidding ID....talk about an idjit thing to do....