You bought them at the same time, right? And they wanted both the original receipt and the original UPCs, right? So since you have only one original receipt, there's absolutely nothing else to do besides send them both.

I'd make sure to point this out to the BBB, and I'd call back and yell some more. As much as I hate it, it's the squeaky wheel that gets the grease.
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Bitt Faulk