Only time my C cards were out was when I was setting up with the dive op at the beginning of the vacation. Otherwise, no scuba police. As far as license, I think the guy in our group that was diving just carried it with some cash in a pocket of his trunks under his wetsuits. Wet money is the norm.
There were 18 of us in our group, so 4 trucks. No one had any problem with theft, but we weren’t obvious with things, either. One set of our group was doing mainly shore dives (we had a morning boat package of 2 dives daily for 5 days, I think they did 2 of those dives total) and they would take full changes of clothes, whereas the rest of us would drive around with our wetsuites half on and t-shirts. We all had coolers, though, and no issues.
There were 18 of us in our group, so 4 trucks. No one had any problem with theft, but we weren’t obvious with things, either. One set of our group was doing mainly shore dives (we had a morning boat package of 2 dives daily for 5 days, I think they did 2 of those dives total) and they would take full changes of clothes, whereas the rest of us would drive around with our wetsuites half on and t-shirts. We all had coolers, though, and no issues.