Update on this since some had expressed interest in the outcome.
Already mentioned that I was required to authorize eBay to charge me to provide the buyer with a return shipping label. So I assume all he had to do was tape the box shut and drop it off at USPS. So far, eBay shows he hasn't, so who knows what he's doing with the phone in the meantime. He supposedly only has until the 20th to ship it.
Haven't heard a peep from either eBay or the buyer since agreeing to and approving the refund/return process - within hours of his original complaint.
In the meantime, PayPal has screwed up my account. They moved the original payment (which had already cleared) back into pending and have already added a pending charge for the refund.
So, now I have a negative balance. When I try to add funds with my CC to zero out the balance, I'm told...
"We're sorry, you don't have permission to complete this action. For more information, contact the person who controls your account permissions."
So apparently I'm no longer the "person who controls" the account, and I'm not permitted to add funds to resolve the negative balance that they keep nagging me is going to result in limitations on my account if not corrected.
You seem to be jumping the gun. Unless Paypal has already taken care of it, do not refund until you get the item back.