Question about purchasing a open box or used Eufy cam

Can someone answer this please. If I find a good deal on say a used or openbox eufy cam set on Ebay. Do I need to worry about any of the following?

  1. Device not about to work because it’s tied to previous owners account?

  2. Previous owner might have access to cam.

  3. Set up issues that might arise if the unit was maybe stolen?

Please let me know. Or should I just wait for sale and buy direct from Amazon or Eufy.