Google Nest Cam Outdoor akku installation without QR Code or Serial Number

[katjas]

I want to reactivate my 3 old (ca 3 years)  google nest cams. I have only 1 box left with 1 serial number. There is no number on the camera or the camera holder.
Is there a way to integrate it in Google Home or Google Nest? 
Thanks a lot for help

[MplsCustomer]

@katjas 

There should be a QR code and a 6-character alphanumeric setup code printed on the back of the camera; you need one or the other to install.

[Beamer]

I have the same problem and  and my camera is barely 2 years old .. and there is no setup code or qr code on the camera ... only a model and what appears to be a serial # on the base ...