I want to build a custom PC to sell through Kijiji. The parts I will be getting all come with a 3 year warranty, which I want to advertise on the ad. However, if I state in the ad that the parts come with a 3 year warranty, should I include a warranty seal on the computer in case someone tampers with the parts and then tries to claim their warranty through me? Or should I even advertise a warranty at all?