This morning the "NOT correct" link in the refund e-mail worked.  After reading more posts I determined that the BTC total for my order was correct @ $25 per board ("full assembly") plus $15 per board for hosting (= $40 per board total converted to BTC @ $126.61 = 0.315931 BTC per board).

I corrected the BTC address, signed the message, and submitted the form.  Expecting BTC soon. Thanks Steamboat and team!