The Thieves That Robbed Big Sean Left Incriminating Note

Big Sean had his Hollywood Hills home burglarized last week, while he was out of the country.

The thieves made off with $150,000 in jewelry and -- more importantly -- some of his unreleased music.

Sean thinks it was an inside job, and we just learned another detail of the crime: The robbers left a note telling Sean where to contact them if he wanted his stuff back.

Bad idea.  Sean has turned that information over the LAPD, who now have a special unit trying to track down the thieves.

Wouldn't it be something if they turn out to be Ariana Grande's goons?