Camera serial number
The camera serial number is on the back of the camera head, directly above the USB C port. Also, If you still have the box for Nanit, you can find the serial number on the bottom of the box sleeve, on the attached barcode sticker.
Floor-Stand serial number
The serial number can be located on the Floor-Stands joint, where the 2 side legs connect.
Multi-Stand serial number
The Multi-Stand serial number is on the bottom of the of the stand. Turn it over, it's a label on the metal plate
Wall-Mount serial number
The Wall-Mount serial number is etched on the top of the base of the Wall-Mount.