4K boxes, master and slave

ITSNOTMYTV That is a great question; they are not shipped at different times unless you requested new boxes at separate times. If you are being billed for more devices than you have, we would be more than happy to look into the additional device details. If you would like assistance looking into the additional TV boxes' detailsIf you could send our team a direct message with your full name, the name listed on the account (if different), and the service address associated with your account, I'd be more than happy to look into this for you. To send a Direct Message, please click on the chat icon in the top-right corner of the screen, next to the bell icon, and then type or select "Xfinity Support" to initiate a direct message.

 [edited: message steps]

As for the wireless 4k boxes, we do not offer our boxes for resale, so you would not be able to fully activate one of our boxes if purchased from a 3rd party. If you wish to have full functionality and access to all your content, you would need to get a box from us.