Looking at identifying a traded and deactivated Sonos device I found this screen you can check, just replace the x.x.x.x with your IP address. Make sure to keep the http and the :1400 bits.
Click the room name and then Zone Player Info to get this screen.
You can see the status at the bottom, NONE means it hasn’t been traded.
http://x.x.x.x:1400/support/review
Traded and timer expired, deactivated.
Still active and not traded unit:
Very risky buying a legacy device now, I suppose this is the first check you could do but at that point you'd have already bought it?.
I bet there will be plenty the get "recycled" the same day they get posted to the new owner..
Good point on a late trade by an old owner.
If you follow the usual guidance to factory reset a used device at the initial power-on and then to add it to your system reasonably quickly the odds of an issue after you’ve gotten it will be minimal.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.