According to Jim Recap: Trashed
As Jim tries to hang some artwork from Ruby on the refrigerator, he finds that there is no room. So Cheryl has him put it outside in the box with the rest of her stuff. When Jim tries to pull the box down, he's covered with all the other junk up on the shelf, and it's decided that they will rent a storage unit to keep all this crap. But when Jim and Andy get there and find out that it will be $60 per month, and not even Andy's sweet-talking of the lady at the desk can get them a discount, Jim does what any sane person would do - he throws it in the dumpster.
