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A lot of malls have parking lot security cameras these days. If it was at a mall you may still have time to get a copy of the tape before it loops back to the start (it would have to be a very slow tape I imagine).
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Go ask the mall-ninjas, but the security cameras I've seen have such crappy resolution that anyone more than 50 ft away, if that, is gonna be very difficult to identify. If you're lucky, you may be able to get something like a distinctive vehicle they get into. Maybe some of the black-hooded ones can weigh in on this topic.
Most important is to do something now to prevent rusting. Any wax, silicon, etc should be removed from the area to be rouched up.
If you have insurance, get an estimate from a good body shop of YOUR choosing, and ask them to name the paint systems they use. There are a handful of main ones, any others would be chancy.
The other guys are right, definitely comprehensive, with a lower deductible, and you'll be amazed how much time they estimate for sanding, other prep, there may be a crease that needs to be filled, and of course paint time (color and clear coats) and all the materials. The point is not to shock you or bum you out, but if you do have insurance, take advantage of it now, even if you have to sacrific to kick in for your deductible.
It would be interesting to set up an SUV or pickup with bumper & window stickers from NRA, Ducks Unlimited, Safari International, and Rocky Mountain Red Meat Eaters (OK, I made that one up).
Then the mall ninjas could watch it from all sides in their usual unobtrusive way and pounce stealthily on anyone who messes with it. Only partly kidding.
The PD in my old town use to take a vehicle and throw in a leather jacket, fur coat, boom box, tools, whatever would make it look like payday.
Then they'd put it under surveillance and pop the bastards.
So up till now, was your truck a virgin? If so, you can take some consolation in your good luck up till then.
You'll get past this. My truck had that 'been around the block' look. The advantage was that in the woods I didn't need to sweat the small branches.