What 'wireless box' are you referring to? The Xfinity Gateway (modem/router combo) https://www.xfinity.com/support/articles/broadband-gateways-userguides? Are you looking to rent a WiFi router from Comcast? Have you looked into purchasing your own device in lieu of renting?
Hi, Ktklein91! Thank you for posting in our community. If you are referring to Xi5 or Xi6 wireless boxes - they are still in trial in several areas. That's why we have a limited quantity and they are only available via professional installation based on an evaluation of the home's network configuration. However, customers (even new ones) cannot request a wireless box even if they have a pro-install scheduled. We are working diligently to make Xi5 and Xi6 TV Boxes available via SIKs in all areas in the near future. if you have any questions, please don't hesitate to reach me.