HP Prime Serial Number Plate

[matalog]

I use my Prime 2-3 hours a day, double handed, or on a desk, a mixture.

I store it in a soft case at the end of the day.

The plate at the back of it with the serial number on it is losing pieces of the serial number every day now, it's falling off, and already unrecognisable. I registered it before, but also scratched my serial into the plastic of the case that I don't touch.

Is the serial number important? Is anyone else's serial number rubbing off with normal use? Is the serial number written anywhere else on the case or inside the software?