The ebay bidding you were questioning appeared to be the live floor bids being entered into eBay. That was a live auction that allowed bids on eBay in addition to their live bids.
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Well in that case that explains why the same account was constantly putting in bids for items that they were already winning. There was nothing on the ebay site that indicate there was live floor bidding.
I apologize for the confusion but next time it would be nice if they would indicate that in the auction. When you see 10+ bids from the same account that that person is already winning, shilling is the first thing that comes to mind.
In general before you buy anything do your homework. Alot of people just take a sellers word or a piece of paper. Also keep in mind a certificate of authenticity is just a piece of paper and is about as good as the person who wrote it.
If you can photo match the item that trumps anything.