Rock Auto does not own warehouses. There are companies that stock parts for any buyer. Rock Auto knows who they are, where they are and what they stock. They are totally reliable and super efficient and if not, Rock Auto would not be using them. Warehousing is a big business in the USA. Here’s an example. I bought an air filter.
https://bobistheoilguy.com/forums/threads/how-does-rock-auto-work.327058/

