You got lucky...Juveniles make the best thieves and murders cause they are so protected by juvenile law...at least that's what the elder thieves who employ their services tell'em.
Coulda been a punk looking for a joy ride but considering your location and "The Timing"?...my moneys on..."You Got Followed Home" by some pro's....and the kids responses to you were text book.
Keep a closed door and all the security you can muster up as...now they know where your Busa lives....they'll try again.
You handled it as best as you could...but next time?...follow him...to locate the adult thief in the cage hiding around the corner who followed you home and dropped Mr. punk@$$ wannabee off at your doorstep and...THAT...is the guy you want...at the very least get his make/model/year/plate# and let the detectives do the rest.
Meanwhile?...If I were you I'd invest in one of those "In-Slab Anchors" (where you bed them in the concrete foundation) and..a kick@$$ lock & chain and alarm system to go with it.
good luck and...L8R, Bill.