They stole your van to do the bank job, found when they got down the road it was full of gear (stuff), too much trouble to empty it out easier to steal another empty van.
Alan.
Or it was just parked in waiting till the next day to do the dirty deed. there must of been plenty of room for several large bags.
The reason most (older) cars get stolen is that someone just wants to get home....
That is one scenario but the vehicle isn't that old.
A friend pointed out to me that it was swept under the rug because they know who did the theft and could very well be someone like a judges, or senators, or anyone of high public offices son.