Identifying kindle books

SITUATION . . .

I want to add books to calibre but when I go into the

library>application support>kindle>My Kindle Content

on my Mac all of the books are saved with file names such as . . .

B001CSM08E_EBOK.azw

QUESTIONS . . .

1. How can I identify the book I am looking for?
2. For some items, there are multiple formats (.azw, .mbp) so how do I know which one to add to Calibre?

Thanks!