Well, thought I'd post an update.
I attempted numerous times to contact the buyer, each time carefully explaining that I needed him to simply log into his Paypal account and change his address to his new address so that it could be "verified."
It seems he simply chose not to respond. Two weeks have now passed, and he filed a case against me as not having received his item. So, as a part of the resolution process, I have AGAIN contacted him, AGAIN requesting that he log into his Paypal account and change his shipping address.
Now we'll see if he responds and how this plays out. I can't help but think I'm being "worked" on here some how; some sort of scam. Since he logged into his eBay account to file the case, he has to have seen my many messages.
BTW, his drum has been packed up and ready-to-ship since Wednesday, August 7...