Find My Stolen Mini Mac After Installing New Clean Mac OS X Installation

My Mini Mac Stolen From My Office and I Think It’s Stolen By My Colleague. All Of Them Are Software Engineer and I Think The Thief Will Install The Fresh Version of Mac OS X On The Stolen Mini Mac.

My Question Is , Will I See My Mac’s Location Even The Thief Install Fresh Clean Mac OS X On My Stolen Mac ?

I Know Find My Mac Information Saved In NVRAM and The Thief Can Erase It Without Booting The Whole MAC OS X By Some Shortcut Keys !

Is The Serial Number Of Machine Pair With The Find My Mac Function on Apple ? If yes , I Can Find It Even Fresh Clean Mac OS X Installation ; No ?!

Thank You All.