I m using Band in a Box 2017 Audiophile for Mac and I have noticed that I am missing a lot of the Real Tracks. My request to have a way to search for only the Real Tracks that are N/A so I can find out which ones I need to buy or which ones have yet to be released?

If you check "Show RealTracks that are N/A" it should show them in order at the bottom of the list.
The DEFAULT.SOL file has all the 2017 tracks in it bb/Data
check that it is the same version that is on the 2017 Audiophile drive that is on the main drive (if BB is run from the main drive.)

That being said if you have the 2017 Mac Audiophile Edition you should have "Everything", as it comes with the Bonus 49-Pak:

http://www.pgmusic.com/bbmac.packages.audiophile.htm
Mac Band-in-a-Box Audiophile Edition

Band-in-a-Box® 2017
Over 2,200 RealTracks AIFF files.
2017 49-PAK: 24 Bonus UNRELEASED RealTracks, 22 Instrumental Studies, 30 MIDI SuperTracks, and 59 Styles for Rediscovered RealTracks/MIDI SuperTracks!
Over 175 MIDI SuperTracks.
Over 2,000 MIDI Styles Sets.
Over 300 MIDI Soloists.
*Jeff Lorber Artist Soloist Sets 14 & 15 not included.
Over 200 MIDI Melodists.
21 Nature Sounds and Percussion Loops.
1,000 Dubstep, Modern and Top 40 Loops.
145 Artist Performances.
Band-in-a-Box Video Tutorial PAK.
Band-in-a-Box® MIDI Songs & Lessons PAK: 25 MIDI add-ons for Band-in-a-Box, including the Essential Riffs and Phrases Series, Fakebooks, complete Master Solos Series, CopyMe, Duets, Novelty Piano Riffs, Country Guitar Solos, and Folk Songs. Learn more >>

Ok.

Ok, so it's just Set 300 the 49-Pak you are missing.
2017 49-PAK: 24 Bonus UNRELEASED RealTracks, 22 Instrumental Studies, 30 MIDI SuperTracks, and 59 Styles for Rediscovered RealTracks/MIDI SuperTracks!