Additional mouse buttons with Raw Input API

Question

I am currently using RawInput for mouse input, but it does not seem to detect more than three buttons. It says that it supports X1 and X2, but none of my mice seem to call them. Ive looked around, but Im did not find anything in google on how to use all the other mouse buttons. If possible, I'd like to find something that, like RawInput, can distinguish several mice. It seems to me that I need to use rawinput with HID settings, but I have no idea if there is a standard mouse button with several HID buttons that I can read or something like that