Strange situation, but you're doing well. In a way, you've got him by the nuts, pity the other neg was withdrawn, both badly affected his relatively little feedback.
How about mailing the one who withdrew neg via ebay, see what he/she says? Either way you've done nothing wrong, the pressure's on him. Sit tight and see?
Another thing occurs, it's kinda early, or late if you like. If he's in London and you're both awake, it's a bit unusual !
edit:- just noticed he admits to being in Australia, explains the timing. I thought COD to them was delivery to a post office, paid before package opened.
Makes you wonder why he doesn't sell them in Australia, but once you get suspicious, it's difficult to stop. He's sold 18, in 24hours, none confirmed delivered if it takes a week.
He's supposedly been an ebay member since 2001, he's not sold much in that time. If he's genuine there's no reason for him to panic, they would still be a bargain, so what's his rush?
