It was the same at the GameStop I worked at. They had a couple copies of Fifas, Red Dead 2, really common games downstairs on the store floor. In the storage room in the back they kept preorders, new games and more copies of games that were present on the store floor. And upstairs a mini “warehouse” where they’d keep the rest.
They literally had stacks upon stacks upon stacks of these really common games. Like all the current Fifas, Red Deads, Far Crys etc etc. It was always baffling to see how many copies of a given game can exist in one singular store. They’d also stop buying these games at some point because they worth next to nothing. They’d be losing money buying them from the customers