I don't think there's been more griefing reports since the update, to be fair. The lack of proper means of storing guns will hopefully alleviate a little bit of the hoarding (though it will definitely not stop it as long as we still have the means to store them, because groups with access to enough manpower and time to find tents will inevitably start hoarding the same thing again).
The root of the problem is, as @Rover put it, the community's stance of "gots to have the loots". Everyone (myself including) is guilty of that to some degree due to our exposure to games in general. And as long as that attitude persists, there'll always be people hoarding, raiding and complaining about there not being guns to find for RP purposes (somehow the complaints are always about not being able to find fully automatic rifles however. There's barely any complaints about finding shotguns, pistols or bolt-actions. #Civiliangunsmatter).
And while I agree with @Craig on the fact that not having a way to store guns at all will definitely be a better bandaid to the hoarding problem, I don't agree with there magically being more roleplay coming from the non "campfire/gear" RPer side. In fact, I feel there'd be a drop in RP because it takes away the value of a base as a hub. And when the hostile groups already have all their RP rifles, what do they have left to go to the bases for other than hostility for the sake of hostility? This issue comes from both sides, not just one of the other.
In a ideal world, everything would be really hard to find. Guns, ammunition, food, protective clothing. That would put value on ANY item and not assault rifles/military equipment. But considering the current complaints with the loot table, making things even more scarce would end up with a lot of people frustrated/leaving, which is a equally bad outcome. All in all, this discussion/issue is something that won't go away anytime soon.
To end with, adding more storage options won't really add anything right now, because most people won't bother with containers that can't hold guns and as we've seen before, adding more containers capable of holding guns will only lead to a small portion of the server having a large chunk of the loot people care about.