What is the difference between on-shelf holds and in-stock holds?

Generally, you will see On-Shelf Holds on items that were “Available” when the hold was placed, meaning it should be on the shelf. Once you’ve pulled the On-Shelf Holds from the shelves, bookdrop them to change their status to In-Stock. Then place them in the holds area of your library for patrons to check out. For more information on the two, see Best Practices for Holds.