I'm still not clear if this person were stealing from each other or taking things home which belonged to the shop, itself. Regardless, whether they're taking blue pencils home, squeegees of rolls of vinyl, it's stealing and once found should be handled behind closed doors. One of my biggest pet peeves is when someone takes something, no matter how small, their mindset is.... well, they can afford it No matter how big or small the article is.... stealing IS stealing.
As for organization, that's a toughie. We're always bouncing a;; around and let this here or there and then when you need it, it's not where it's supposed to be. I needed to do something at home last weekend and took one of our 6 ladders home. Didn't finish it, due to the rain, so it stayed at home. Wouldn't you know, Wednesday, we needed THAT one. it.
We have many workstations all around the shop. Each one is filled with just about everything ya need except double-sided tape. That kinda stuff and certain other items have specific places, but you'll see one area start to fill up more than another, so I usually go around putting things back once a week or so. We have literally 100's of squeegees around, tweezers, picks, knives and so many other tools, but the bigger ticket items go back when finished being used.... or at least at the end of the day, like grinders, drills and electric or pneumatic tools.