Hi again Metha23.
I don't think it should be an issue for HTC/Orange to have the phone if the sticker is slightly split, as long as it is still there and hasn't been tampered with at all. I thought you'd said it was a friends phone - I really wouldn't mess any further and ask them to speak to HTC/Orange... end of the day, it is their contract with Orange/HTC, not your's!