There may be a good reason why the sellers not been in contact.
I assume you read his payment & shipping requirements and your not suddenly saying you'll pay in a different way, or require shipping outside of what was listed.
Sometimes people renage on their sales - I won great slide copier last year, low price - high postageit never arrived, on chasing things up the seller blamed someone else who was supposed to have posted the item, he gave a full refund, then changed his ID on Ebay
Another pulled an item I'd bid on with 2 minutes to go, he'd set no reserve, in this case a complaint to Ebay and the next day Ebay UK changed their terms to stop a seller withdrawing an item in the last 24hrs, unless the reason could be proved to be genuine.
We don't know the seller in your case and what his feedback history is like, you must take this in to account in deciding what to do
Ian