[mama_san]

or you can just walk into stores and take photos of the s/n, UE /Logitech sually have its s/n outside of the box.

UE Serials are found on the product. I tried getting one of eBay and the seller said the product is sealed and he can't get to the S/N inside, as for logitech, the serial number outside the box are separate to the one of the product, Logitech have 2 S/N's. One for the box and one for the product

oh i didn't know. thanks for that!