I would expect that the shop will be able to find the transaction on their PC/Sales till. This is include the serial number but almost definitely the box would have had a bar code and scanned.
This happened to once. I took the physical device to the store and a copy of the bank statement showing the date of the transaction. I "told" them to look through the Sales records and hey presto, the manager went to his office and came back with the details.
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