I'm underwhelmed.
They found knives, but people were camping there, and were made to leave their tents and everything else behind. Maybe they were food-prep or other utility knives?
They found mace, but that is something a lot of people carry for self-defense. Or is it banned in NYC?
They found hypodermics, but those aren't usually weapons.
They did mention that some Occupados had been seen with metal pipes wrapped in cardboard.
And who's to say the items weren't left behind by non-political homeless folk, before the Occupation?