That's something that you get if you pick up the case in-store.
If you order online, a copy of the "Proof of Purchase" from your online account or a copy of the actual "Order Invoice" that arrives in the box should suffice.
Isn't that what they ask for in #1? Or do I make a photocopy of the receipt for #1 and also send that same receipt for #2?
I dont recall ever sending both an original receipt and its copy for any rebates.