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HankronDavid's rule of thumb is, if it's a private auction don't bid. Simple as that. Unless there are exceptional circumtances (the Hope Diamond being offered by Christies or a T206 Honus Wagner being offered by MastroNet), there's no good reason to be hiding bidders. At least no reason good enough to induce me to bid.
I will note that I have bought from foreign sellers (from England, Italy, Romania, etc) on eBay and have not had any trouble whatsoever. Most of these items (foreign issued Hollywood real photo postcards) were inexpensive ($9 at the most), each of the sellers appeared well versed in the material and had top notch feedback ... The vast majority of these postcards are in foreign countries (point of origin), and ordinarilly have to be bought through these countries.