I brought in a form organizer, that I picked up for free, to use at the customer counter when I worked there. It disappeared one day, I assume some jackwagon from another area thought it was a company item and felt they deserved it more than me. I explained to my sup that it was my personal item and that I would be calling the alert line to report the theft. It somehow managed to reappear the next day.
I also bought a beverage dispensing cooler for mixing some gatorade for our sort during the summer. My sup kept it in the office, marked with my name and "for local sort" on it. That lasted all of about 3 days before someone felt it would be better suited at their house. People are just awful.