Thanks for saying it is a hypothetical question - that would have been nice to know, oh, I don't know, in the beginning?.
It was an obvious hypothetical question from the get go.
A hypothetical question can be summed up in this definition;
When a hypothetical question is posed, it includes all the facts in evidence needed to form an opinion and, based on the assumption that the facts are true, the witness is asked whether he or she can arrive at an opinion, and if so, to state it.
Steve just asked for opinion, based on his knowledge of the evidence at hand.
To answer Steve's question,
I personally would talk to the driver, one on one, and voice my concerns.
Two things I abhor are a thief and a liar.
If I knew, for fact, that he was stealing I would "Rat" him out in a heartbeat.