I'd the seller took the time to make sure they were released properly then
I think that he should be fine. As demonstrated here. But your caution is
proper for anyone buying any modem from an unknown party.

On Thu, Aug 8, 2019, 2:33 AM Thomas Scott <mr.thomas.scott@gmail.com> wrote:

> Well the problem with the DPQ3212 isn't that it's not compatible with Cox,
> it's that it was Cox's choice for their EMTA since they upgraded to DOCSIS
> 3.0 over a decade ago. Part of their phone service included that modem
> which could also be used as a gateway for internet services gratis.
> However, the modems often times weren't returned after phone service was
> disconnected and customer mistakenly thought it was "their" modem. So if
> modem is never returned to Cox, they get flagged, or if they get returned
> in the wrong manner, they get flagged, if it falls into a MAC address range
> that was marked as decommissioned, they get flagged. Once it's flagged it
> takes an act from an inventory specialist to re-register it to an account
> and it's on high on Cox's priority as so many of these are modems that are
> as far as Cox is concerned, stolen property.
>
>  If you have a DPQ3212, I would get the serial number and mac and call in
> or head to one of the retail stores and make sure it registers on your
> account.
>
> -Thomas Scott
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