Yep.So RA has been doing a weird thing: the "truck" symbol won't always appear, but add a small item to your existing cart and then go to the cart, they'll still be shipping out of the same place.
Basically, don't always believe the truck symbol. Add an item to an existing cart and then go to the cart and see. This of course seems to be most common with small parts like small gaskets, filters etc.
I think their system is smart enough to try to avoid individually packing and shipping a small, lightweight item when possible.
I have very distinctly observed this when mocking up several carts in the past couple months.
There's also another secret -- make a list of the items you need, but in order of priority. Start by adding the most important item to your cart and building the cart around that item. Always have 2nd choices for items if possible.