One time I pulled into a gas station, the local neighborhood one, and went in to pre-pay (so I wouldn't over-pump, I find that convenient when I'm on short cash), and the lady informed me that the pump already showed $20... turned out that the prior customer simply drove off. :| I didn't see anyone drive away from that pump either, so it had to have happened a bit earlier. My car was so low on gas at the time, that if they had tried to press it (thankfully they didn't), it should have been obvious that $20 worth of gas didn't go in my tank. (Would have filled mine, actually, but I have a feeling that the drive-off was probably some SUV driver that felt that they were fighting back against the recent raise in gas prices, or something.) Kind of shocking to be briefly accused of something like that though, especially for someone with a habit of pre-paying.
As for what happened in this case, the person probably didn't actually steal 27000 gal of gas. More than likely, they did steal quite a bit, but then the company went back and accounted for *all* book-keeping discrepencies, and decided to go after this person for all of it. Kind of like, getting into an accident, or getting your car hit in a parking lot, and not doing anything about it, and then when you get hit by a live driver, going after them for the sum-total damage that your car endured. Why one of those is considered both perfectly legal and "standard procedure", and why one is considered "illegal insurance fraud", even though they are mostly the same thing, is beyond me. If anything, if it wasn't discovered until now, shouldn't the gas dealer be considered negligent as well, for not having any human personell manning the stations at all?