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Sbg10 was purchased July 6. All the research was that Xfinity was cable. Tech told me today that it is fiber.

I read on the aris page that the box was not returnable if opened. Can I return it?

I think your Xfinity Tech was referring to their Fiber Network that reaches your curb.  Xfinity residential customers have cable Internet (coaxial cable connection in the home).  Unless they’re offering in some area.  

If you have coaxial connection in your home, you have cable Internet.