...The armory? As far as we can tell, Crawford most of have been almost entirely wiped out especially when considering the fact that that many zombies, it's unlikely anyone just walked out. And, considering Vernon was in the sewers and Molly was outside (and likely not the only "loan warrior" around), SOMEONE would've noticed a mass exodus from Crawford.
So, seriously, where did the guns go? Did Vernon and his group maybe get in earlier and take them for themselves? Cause it seems weird to me that they'd just be gone.