That's a bit of a mess.
The AlbumData.xml files should not be visible. I would trash them
The files called
library6.iPhoto, library.iphoto are not Libraries. They are database files from an older Library (v7 or earlier). You can trash them too.
That means you have two actual Libraries. To tell which is current:
Hold down the option (or alt) key key and launch iPhoto. From the resulting menu select 'Choose Library'