I purchased a used/Open Box MacBook Pro from my local Best Buy. Started setting it up, signing into iCloud, and Messages (honestly can’t remember for sure). Next morning decided to return it for a different one. Got in a hurry, and I factory reset it the new way (through System Preferences - “Erase All Content and Settings” - see here: How to Factory Reset a MacBook, iPhone, iPad or AirPods)
However, now the returned one is still on my Devices list that shows up on any of my iCloud devices (iPads, iPhone, new MacBook). I have gone through the steps to remove it, but it persists. I have gone to appleid.apple.com to remove it – it temporarily goes away but when I sign out and then back in again, it re-populates (this last happened when on the phone with Apple Support - I was so excited when it worked the first time I didn’t sign out and back in to check before thanking them and hanging up. Also they generally say it can take “a day or so” to settle).
I am kicking myself for not meticulously being sure I signed out of iCloud, Messages, etc., before erasing the machine and returning it. Is there anything I can do now to force remove it from the list? Should I be concerned that the machine remains out there in the wild while it’s still on my iCloud device list?
P.S. FYI - it has been successfully removed from the Find My App at least, but it remains on my iCloud device list.