If you wanna know if tracker has those mp3s indexed, try with Code: tracker-search -m > /home/user/MyDocs/AllMusicTracksIndexed.txt you will find a txt file in your MassStorageMemory main directory with all your tracks which got indexed. That command must be run when you're not in mass storage mode.
tracker-search -m > /home/user/MyDocs/AllMusicTracksIndexed.txt
NOTE: Limit was reached, there are more items in the database not listed here