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<p>[QUOTE=&quot;calcol, post: 26160767, member: 77639&quot;]If a seller has sold a buyer a single coin just once, they have no idea about your collection or even if you are a collector.&nbsp; Folks sometimes just buy one coin or they’re buying it as a gift.</p><p><br /></p><p>But there are techniques that can be a starting point for further investigation.&nbsp; It’s possible to search images on a website for text data, like cert. nos., using OCR techniques.&nbsp; Or they can just do regular image searching.&nbsp; So, if someone, like an eBay seller or associates, knows you have a coin with a particular cert. no., they can search coin forums and other websites for the cert. no.&nbsp; Once they find it, they’ll have your ID on the forum and see other coins you have posted.&nbsp; Then they can decide if they want to go further.</p><p><br /></p><p>Why risk it?&nbsp; It’s pretty easy to post pics of coins in slabs without revealing label info.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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