ReorderableList: How to access its items when built without a serializedObject?

This sounds kind of basic, but I can’t find a way to solve it.

If I have a reorderableList built like this (instead of using a serialized object), I’m unable to find a way to access the items of the list.

var reorderableList = new ReorderableList(items, itemType, true, false, true, true);

I mean, there’s no reorderableList.items property or reorderableList.ItemAt(index) method.

Any idea on how to get it?