My guess, when I first heard of this a few days ago, what that the guy, on his way to down and out homeless, managed to hold on to some personal possessions that were valuable, useful and portable.
I'm seeing a pump shotgun, a .22 rifle, a flare gun and a pistol I can't identify. Also, a case for the rifle, a couple cheap holsters, some unknown accessories and a poseur's bat belt.
"5000 rounds of ammunitions!" is probably 10 bricks of .22LR.