Bitmain order ID also seems very simple, maybe it can be used as a way to track how many were sold.

Most of the items are sold out and the only thing in stock is the psu.  I don't think many people would order a psu alone considering the outrageous shipping they charge.

Order format: xxx 2018 01 17 1xxxx

Someone can make a dummy order with the psu and simply not pay for it and we'll have a rough estimate on how many were sold if the order numbers are not obfuscated.