[G-spec]

I'm not gonna jump into this conclusions I have no idea what was going on in this cop's head, I will just present the facts and I would like to know what to do.

My brother just called me an hour ago said cop pulled him over did the typical procedure, license insurance papers etc... anyway he didn't get ticketed or nothing, it was just your typical profiling road stop that I told him he would be getting from cops when he tinted his car and made it stand out.
So basically the cop never gave him the insurance papers back, he said he kept pleading with him telling him "hey I need my papers back you still have them" so the cop got pretty annoyed and basically told him "fck off I already gave them back to you" and left it at that

bro had no choice but to leave the scene, so my first thought was look at the ticket, find out cops name and what station he's at so you can go make a formal complaint, since there is no other logical way to deal with this bs anymore...
But no ticket was given so he has no way of finding out who the cop is, my second suggestion was for him to call ICBC first thing in the morning and make them aware of the situation and then go down to his insurance office and have them print out another set of papers.
Is that the right course of action ?
I mean I can't imagine at all why a cop would willingly just take someones insurance papers, for what reason ? makes no sense to me, I don't understand what happened