I need to find the serial number of two of my missing devices
I need this serial number but don't have the computer in my possession. It was stolen.
iMac 21.5″, macOS 10.14
Question marked as
Sign into https://appleid.apple.com/ .
If signed in on a computer click Devices on the left side of the screen. If on a mobile device tap the downward facing arrow near the top right and select Devices.
Then tap the device from the list to get its serial number.