Slide Remote Internal Serial Number?

Hello - I have several Tivos, and had an extra Bluetooth Slide Remote (C00240) that I didn't need. I sold it to someone online, who claimed it was DOA and returned what looks like a different (damaged) remote. I recorded the serial number inside the battery case before I sent it. The one he sent back has the same serial number, but it appears to me to have been tampered with (the serial number is a small sticker).
Does anybody know if there is an internal version of the serial number that I could verify if it is different remote? Appreciate any help on this.