Default [Q] Do HTC know if your phone is shipped S-on or S-off?

Reason I ask is because everyone here recommends you leave your phone S-off when returning to stock. My phone is a carrier based phone (O2-UK)

I figured that all phones under 02-UK are shipped as s-on (from experience only, I worked with 02 and only had a few HTC phones where I checked and they were S-on)

My phone has to be sent back for repair. At present it is S-off with locked boot loader and completely stock Rom. I can easily go back to S-on if needed so this is out of curiosity