For the Monster promotion, does it matter which type of cans you buy if you have to upload the receipts anyways?

Just got a white monster with the BO6 QR code on it from the vending machine at my job and found out that I’m not even able to use this can for the rewards since I don’t have a receipt.

Does anyone know if since I just need to upload receipts anyways, can I just buy like 7 Monster Rehabs or Ultra Vice Guava/Peachy Keen at once (my preferred flavors) and upload the receipt for those? Would it also work if I ordered a 15 pack of any flavor from Amazon and screenshotted the Amazon order confirmation?