Can anyone in VMF clarify something for me?

It’s a Saturday. I come in and my promaster is gone with an LLV left in its place. The oil was changed a month ago and there’s nothing is nothing wrong with the vehicle. I’ve put in no work orders. The guy who took it left the LLV key with zero notation or explanation. VMF is closed and there’s no way to contact him.

What actual reason is there for this? Cuz the random and unknown nature is more annoying than having to work out of a different vehicle than what I’ve been in for 6 years.