Stolen MacBook

See the following from If your Mac is lost or stolen - Apple Support

Find My Mac is the only Apple service that can help track or locate a lost Mac. If you didn’t set up Find My Mac before your Mac was lost, or you can’t locate it, these steps might help you protect your data:

1. Change your Apple ID password to prevent anyone from accessing your iCloud data or using other services (such as iMessage or iTunes) from your Mac.
2. Change your passwords for other accounts you use with your Mac, including email, banking, and social sites like Facebook or Twitter.
3. Report your lost or stolen Mac to local law enforcement. They might request the serial number of your computer. You can find this information on the original box or receipt you received when you purchased your Mac.

katem84 Said:

"Stolen MacBook: My MacBook was stolen ad find my mac was off. What can I do now?"

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For Thought:

Backtrack your Locations (i.e Retailer,  Restaurant, School, Hotel, etc.), calling them, or going there in person. Perhaps it was placed aside, in a "Lost & Found" location. Also, contact the Local Law Enforcement Agency. Perhaps it was handed over. You never know. :)