Good questions - ones I simply don't have the answer to. From what I understand, he's not even a resident of California, but of LV. I'm not even sure if a non-resident can get a carry permit in LA, or California for that matter. But, he was a private residence, and not in the public where this occurred. I'm not at all familiar with the handgun laws in California or LA, but you may not need a permit to possess them, just to carry them. Again, I'm not sure.
To have a carry permit you have to get it from the sheriff or police chief of the county/city of your residence. There are no non-residency permits. CCW is 100% discretionary, meaning, you can claim all the good cause you want, if the top cop doesn’t want to give you a permit you don’t get one.
It is possible that he is a California resident. I think he was a bar owner/promoter from the L.A. area who got hired to promote/co-own clubs in Vegas. It is possible, being a club owner, that he used to carry a lot of cash (bar receipts) and that he got a CCW permit based on the fact that he carried a lot of cash.
But assume he does not have a carry permit. If he had no permit, this means he has been going through the hassle of keeping a gun in a separate locked case which he brings with him it into the house and back back to the car each and every time he goes somewhere. IMHO this is not likely to be the case.
The other possibility is that Paris, or the guy, kept a weapon at Paris’ house. I think she lost her right to own a weapon for her DUI/drug conviction. I do not agree with this law but it is the law. And if the boyfriend just left a weapon at the house of his girlfriend, he broke the law. You cannot leave a weapon in the possession of a felon either.
I am just flapping my lips (fingers) in a mental exercise. 2A rights in CA are very hard to keep. Hopefully it will change soon if we win the Sykes case in circuit court and it will turn CA into a shall issue state.
In any event, now that this boyfriend has been popped for DUI, he will probably lose his right to armed self defense too. This will mean he and Paris are even more vulnerable to armed attacks like the one he successfully staved off. Our laws are very bad.