Macys SA's have to pull what a customer has paid for from a different location and pack said item if not available at Macy. com. I have paid for 5 or 6 items and had them shipped from other dept store locations. Every single thing I have received from an actual store and not the warehouse was packed horribly or had some sort of defect from the way it was mailed out by an SA. Macys SA's can tell you where and how many any store has if not available in the warehouse. The SA is the one person in charge of pulling and shipping according to my SA at my local Macy's.
I worked at Macy's here in Nashville. We had a separate team, called a pickoff team, who went throughout the store gathering items customers had ordered. It has to be handled by a different team because we were too busy with other things on the floor. I worked in a commission area (men's suits) and when they announced they were going to start fulfilling from stores, I wondered how I would get that done and sell suits. But, there was a separate team who took care of it.