Hmmm... Rereading this. Could they have popped the trunk and climbed in through a back seat passthrough and back out? That would explain the folded down rear seat, the stuff in back being askew and the way the headliner was ripped. Also, popping a trunk with a remote is probably a lot easier to do than the regular locks.

Of course, my natural paranoia makes me wonder if they were looking for something specific. Maybe not an empeg, but something smaller. The way the thief searched everything makes me wonder if it (non-humans do not rate proper gendered pronouns) was searching... That bothers me more than a smash and grab would - it implies intent and thought, usually characters that it lacks.

Again, paranoia, but did you keep a spare key or remote garage door opener in the car? A tiny breakin like this, small electronic theft and searching... Is your registration and insurance card in the car with your address printed on it? I can imagine (not sure if it would happen) a thief breaking into a car at a restaurant (where they know the driver will be away for a while) stealing a garage door opener or spare key, getting the address from the registration and then going in search of bigger game... Paranoia...

Edit: fixed typos and increased paranoia level.