ARRIS Modem

I bought a Hitron waiting for this to arrive, and now I’m too nervous to swap it out and deal with my ISP over the phone. This Surfboard has never been opened- never attached to a Coax and is factory sealed. Sold out on Best Buy for months and selling at $219 on Amazon. Tried to buy one used and got an empty box with just a power cable. I’m getting a Hitron 5G cellular router backup, so my OCD wants my gear to all be the same. I’m using tplink XE75 mesh. My return window on Amazon closed July 17th, so trying to recoup now!