I spoke with Chas at Stern just now about the toybox multiball failing to start.....toybox gets loaded up, lid goes to open, lid closes (without opening up and dropping multiball), then 7-10 seconds later the multiball drops (wasting anytime for ball save, inherently causing multiball to be shortened drastically). He didn't have an answer for the problem but was going to speak with John, the developer of the game, and call me back.
We did go into the Aerosmith Game-Specific Tests, Toy Box Motor Tests (37/36). I manually opened the toy box to make sure that the motor was working to raise and lower the mech inside the toybox to dump the balls and it was just fine.
So basically I don't have an answer yet, I'm still waiting for them to call me back. Like I mentioned, this was a BNIB game that I got from The Pinball Company around/less than two weeks ago. The Pinball Company referred me to 1-800-KICKERS for tech support.