I guess if I was in such a transactional situation, I wouldn't see any purpose behind telling the people in the OB what we were up to LOL. If the idea was to verify a watch's authenticity and get it checked for any issues prior to the sale, you could go in there with the seller as his "friend" and just be there and listen/observe while he gets his watch checked. No need for the seller to walk in and announce, hey, I'm trying to sell this guy my watch and he wants it verified authentic, help me out.
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