I hate to say it, but he is likely dead. Over the years I have had a few online deals fall through because of a death. One memorable one was a small portable 1 HP outboard boat motor I bought off ebay nearly a decade ago, I went through the whole mess of sending a paypal payment, waiting for it to arrive, disputing the charge with paypal, waiting for their attempt to contact the seller to time out, getting my money back. Then finally a about 2 months after the initial sale, I was received an email from the guys next of kin, who was going through his backlog of messages that wanted to know if I still wanted the motor.