Twice this has happened to me but I cannot find a way to reproduce it.

In the I and J zones I have twice managed to open the belts of players I am not in team with. It first happened a few weeks ago and as it has never happened since I thought it might be some random one off. We had not killed the runner whos belt it was so it was not a fresh kill so to speak but a friend of mine could open the belt as if he was in team but not loot anything from it. I got the standard message of belt locked!

Then yesterday another friend of mine was killed at a gr and I killed the adversary and then went to loot his belt, purely by virtue of a habit and found that I could loot it and grabbed his item. We were never in team however. I just dmed him and told him I had looted it.

P.s I have no hack on the char I am referring to (Gen-tank).