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relisted on eBay [...] Wonder what happened?
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My guess is someone broke in to the high bidder's ebay account and used the account to cause a bit of trouble, including placing a high bid on the GT40. (looking at the biddder's feedback for the 5th, something strange happened on that day). The previous high bid for the car was $230,000, but that was probably below the reserve.
Poking around a bit further, the seller has listed twelve cars on ebay recently, not one of them (except for the above car) met the reserve.