Admittedly the WSO is 2 weeks old now so perhaps he has forgotten about it and hasn't been online at all.
But if he has been online, even to check his emails, he would see that he has received a payment from Paypal. I have posted in the WSO thread and I have also PMd him and haven't received a reply.
Do I just sit back and wait longer? I guess it is possible he hasn't been online for some reason.
I guess there isn't much more I can do than that anyway. It wasn't an expensive WSO, but that isn't the point. I think if you are running a WSO you need to be there to give the buyers what they buy.