Did he already take your stuff?
If so, did you get an itemized reciept of everything?
Did you get any of this stuff he told you in writing?
How would he even know you owned any guns unless you volunteered that information?
Or if he knew, how would he know how many and of what type?
I'm not going to hoist the BS flag, but this doesn't sound right. Or if this happened, I'm guessing it was just some dude with a fake badge and you got robbed.