The QR code is printed on the bottom of our Google Nest Outdoor Cameras, as is the 6-character Setup Code if you're not able to scan the QR code. The camera is just attached with a magnet, so you should be able to pull it loose to at least read the Setup Code. The QR Code and Setup Code are printed on the back of our Google Nest Hello Doorbells.
Note that the previous owner/resident needs to remove the doorbell and cameras from their Google Nest app; see this help topic: https://support.google.com/googlenest/answer/11151047?hl=en#zippy=%2Cother-google-devices-set-up-in-....
If they fail to do that, even if you reset the devices, you'll get an error message saying the device is connected to another account: https://support.google.com/googlenest/answer/9249728?hl=en
Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.