New w/o box. Was going to use this, but ended up with something else. Past the return window. Our loss is your gain! Cross-posted, will sell to the first person to pay. Recommended on Wirecutter - see below. Motorola MB8611 DOCSIS 3.1 Multi-Gig Cable Modem | Pairs with Any WiFi Router | Approved for Comcast Xfinity, Cox Gigablast, Spectrum | 2.5 Gbps Port | 2500 Mbps Max Internet Speeds $240 w/tax new on Amazon Notes from https://offerup.com/redirect/?o=V2lyZWN1dHRlci5jb20=: If you have a gigabit or multi-gig internet plan and your ISP allows you to use your own modem, the Motorola MB8611 is the best of the DOCSIS 3.1 modems that are widely available right now, thanks to its relatively low price. You need a DOCSIS 3.1 modem to guarantee gigabit speeds from most cable ISPs, and some ISPs like Sparklight recommend DOCSIS 3.1 modems for new cable modem activations.