not sure what you're expecting here. Nobody is going to pay 300 BTC for a 100 BTC bar - the added value of the hologram error is maybe worth 2-3 BTC *at most* (if that) - so a max price of 102 or 103 is far more reasonable. You've already had an offer of 102.5, maybe you should take that and accept the 2.5 BTC profit.
Will
102.5 is far too low. An unredeemed bar carries far more value than a redeemed bar (not counting contents). IF redeemed 100BTC bar went for ~2.5BTC than an unredeemed should be capable of going for far more - perhaps 120BTC.