I think at that point is where you say, "well, can you find out please?!"
I once bought a case of beer that fell apart as I was leaving the store (I was carrying it by its handle. The handle tore away from the box, the box fell onto the concrete, and the bottles smashed). I went back inside the store to tell them about it, partly so that they'd know about the mess and the broken glass, and partly to get a replacement case.
The cashier literally asked "What do you want me to do about it?" I responded as I indicated above. She looked very startled, as if she hadn't expected me to actually have an answer. I did get my replacement case, though.
Quite an old story...in 2000 (told you) I was working doing data entry for the 2000 census. The building where we were housed had pretty tight security - there was only one open entrance/exit (except for fire exits) with an xray scanner for your purse/lunchbag/whatever, and 2 or 3 guards. There was also a guard who was supposed to patrol the parking lot in golf cart. One Sunday morning I was getting off my shift and walking through the parking lot, when I saw a car come zooming up. One man jumped out, smashed a window in a parked car, grabbed a handful of CDs that were in the front seat, jumped back in his car, and they zoomed off. It took about 15 seconds; I didn't have a chance to react. So I got the license of the parked car, as much as I could remember about the thieves' car, and went back into the building. It was between shift changes, so not a lot employees waiting to get in. I told the first guard what I had seen, and she stared at me and said, 'What am I supposed to do about it?' Fortunately, the other guard was a bit more on the ball, got on his radio to call the parking lot guard, called the police, notified the employee, etc.
This also qualifies as PD, because it turned out that the parking lot guard had been snoozing in her golf cart instead of patrolling, so she didn't respond to the radio call for nearly 30 minutes.