Eye serum
We don’t really know what eye serum is, but we assume that it’s for when you have red eyes or sore eyes. It’s probably some type of drops you put in sometime in the morning and at night. This person keeps them in a special drawer, so no one else can have them.
They even went the distance by leaving a note that is seen once the drawer is open. It says that you should not be here in the first place, because it’s just their eye serum and that doesn’t belong to you. We couldn’t agree more, so close the drawer and go buy your own.