MacOS – How to locate a stolen MacBook that didn’t have Find My Mac turned on

How to get serial numbers for displays:

Go to /Library/Preferences/com.apple.windowserver.plist. Open this with TextWrangler or a similar utility. Look for a DisplaySerialNumber key with an integer value that isn't 0. With any luck, this should be the s/n of your display.
If you haven't used this display for a while, the records of it may be gone.
Also, it appears that this isn't guaranteed. Double-check if possible.

How to get the serial numbers for iPods:

Open /Library/Preferences/com.apple.ipod.plist.
Look under the Devices dictionary. Any iPod you've connected will have all its info there, including the s/n (under Serial Number).

Good luck.

It depends. If your machine was password protected, you might be out of luck. If not, there are a few possibilities.

If you have SSH enabled that might be an option. Also, if you had any remote access programs installed, like TeamViewer or LogMeIn, you have a chance to find it, assuming it's connected to the internet.

Regardless, I suggest contacting Apple and telling them the serial number of the machine and that it was stolen. If it's brought in for service, you might be able to get it back. (Although Apple has no official policy on this, it doesn't hurt to tell them. I contacted them when my iMac was stolen. Like I said, not much help, but it's better than nothing.)

PS: Check this out. You might find it inspiring at least.