Where can I find my Macbook Pro Serial number if the device is on Find My but not on My Devices?

I know, I checked all the other links. I just don't understand why it shows up in Find My, but there isn't a possibility to click the computer and see the serial number. Thanks again. Definitely recording all of my serial numbers elsewhere from now on.

Yes, I know. I used to keep all this stuff, but some of my files were so large (450GB Polar Bear single shoot), that it wouldn't ever upload correctly. iCloud has come a long way, so now I'm all in on the cloud backups. Just can't believe that they found my backup drives (I was moving from my seasonal gig. Otherwise they are NEVER in the same location). iCloud has some old old files, but I can't see the serial number as it seems linked to the same interface as my account settings on AppleID. This is why I never worried about it. Somehow there's 2.6GB of photos and videos on my iCloud, but there's no way to track down which device uploaded them by serial number.

I checked that screen many times, but without it showing up in iTunes I can't think of anywhere else it might be. There's not a clickable link in Find My to see the serial number.