>> some time during the night as debbie streeter slept a thief sneaked into her garage and stole herd some help. my car's gone. >> every time you walk outside you're looking around and see if someone's watching you. at:night you're double checking doors and windows that you never did before. >> what happens to cars after crooks steal them? >> as we've shown you for nearly a year we've been watching this fencing operation from behind the scenes. a place where thief comes to sell stolen goods to other criminals. >> what's going on? the guys behind the counter aren't crooks. they're really undercover detectives. it all happens at this little store tucked away in the shadow of the vegas strip and meant to look like a shop that sells and installs car audio systems. it's where we first saw suspects selling guns and cars. >> i got $2,000 on me. >> and an alleged counterfeiter making bogus bills. business at this storefront is still booming. this guy is here to sell a grenade and he's looking for top dollar. >> 300 is what the final sale was. >> and on ebay, right? >> lieutenant dave loge yo