Whether or not there is VAT on the item, there is VAT on the buyer's premium. That is not refundable even if the item is exported.

Regardless of what you bid on, you should have someone look it over for you beforehand and not ever trust the auction description. Many dealers will do this for you for a small fee. It also helps to have someone do the bidding for you - it insures that the price doesn't get run up.