I recently purchased a brand new clarinet. It's made of hard rubber and I like the instrument. The problem is that only the lower piece has a serial number. The seller says that's the only piece that's numbered and there's no problem. Seems to me that (1) if I wanted to resell, there's no way of "proving" both pieces were intended to go together, and (2) if I take it for repair and there's more than one instrument of that type, there could be an inadvertent (or intended?) switch in parts. In any case, was wondering if anyone on the board had a recommendation for me. Should I forget about it, or pursue it? If pursue it, what to request? The seller says none "of the batch" has a serial number for that part.