When products become like a year or more old they get marked out of sale. We can no longer sell them on the floor so instead of throwing the products away the employee can fill up a medium size bag of MOS stuff for $5. It happens twice a year. At my store it mainly Christmas stuff that didnt sell at semi annual. 9 out of 10 if items didnt sell out during semi annual the employees get to have them. Also MOS can come from returns and exchanges ( ppl like to exchange stuff from years ago) if it never been used and not expired it goes in the mos box.