We have the same thing when we leave too. Sometimes someone is having a driveway done and know that we aren't there...or
We have a neighbor who bought a couple of years before retiring and their home sits empty. Most of us have parked in their driveway for one reason or another for a short time; a garage-driveway party, extra guests, etc.
If you are really anxious, call the sheriff and ask him to run the plates.
I wouldn't hesitate to email the neighbor that you know.
My first reaction is that it is probably something innocent.
Did your house sitter say whether it was a regular van or a service type van? If it was a service type van, than I would really be worried.
I will drive by tomorrow and look.
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