Let me try to communicate with this guy; if he doesn't respond, I'm thinking he may have some kind of email delivery problem (just as some forum members have trouble signing up because they don't receive the confirmation link email from this software). If that seems to be the case, I'll let eBay know about it so they can try to help the guy.
The new price is in the bargain territory for HB euphonium, so I hate to see it "go to waste."