Don't sweat the photo or the name and address thing. Scare tactics. All about power tripping. The only thing that sucks is they have an idea what a R1 and the DPA4061 look like. You were doing your stealthy best (and with gear that is really hard to see), I am suprised to see they popped you, unless you were trying to read levels or fiddling with something. Just being still, is not enough....that means they were looking at you for while....something drew them to you before they noticed you having a very stiff neck.
Can you tell us exactly what you were doing? Where you were standing, if there were lights on you, the type of hat you were wearing, all little details would help the next set of people avoid getting popped...including yourself.
And always remember, they cannot take your gear away...including your flash card. I would, in the future...keep a shitty 8MB card to give to them when you do the slight of hand popping your real card out. Give them that. and walk away with a recording....