Let's face it, saying "search your emails for the BTC address" sounds spectacularly dodgy.  BFL is right not to cancel orders unless the person requesting the cancellation can prove they placed the order.  Otherwise, anyone could cancel the orders of other people in the hope of reducing the size of the order queue - either for shit and giggles or to get their own order sooner.  I expect that all the ASIC companies are going to get hit by refund scammers.