I think you mean “Which box, as I have got two?”
To which the answer is whichever one is set as your main box for EE TV.
if you have any recordings from EE TV (i.e. not terrestrial TV) this will be box on which these play.
Hello, either box serial number would be fine. they will both be connected to your Hub and on the same broadband connection from your property to the exchange.
thanks
David