Don't do anything until it is confirmed that the money is in your account. You can get a personal confirmation by phone. Did that when I sold a B3 to a guy in the Netherlands.

Having my own trouble with an Ebay sale. Sold a set of Roland Bass Pedals. Buyer contacts me for a refund and says three of the pedals don't work. This is a no refund sale but I get concerned since I tested them before packing and tell him to make sure they are on a flat surface and if you look inside there is a contact adjustment screw for each pedal. Maybe they got banged around in shipping. Gets back to me and says he tried what I said but one pedals still doesn't work. I feel bad for the guy so I send him a return shipping tag.
Got the pedals back today and they work perfectly !!!! So much for being a nice guy.
I still haven't refunded his money and Ebay says they will block him from my sales and put a watch on him which may result in him getting kicked off Ebay. They also suggested I ask him to agree to a partial refund. I'm going to have to think this over. I've always trusted people and have been lucky in 147 transaction on Ebay but I guess there's always a first time.