Go to your black ops 2 root folder
Double click on t6r
Double click on player
Double click on dw
Double click on Random Hex folder (Mine is 78EC5AD3)
\t6r\player\dw<your xuid is the folder name>\
Copy all those files and paste in %LOCALAPPDATA%\Plutonium\storage\demonware\18397\user\
You can use run (windows key) + r to open that folder
You should have your stats recovered.