We missed this one:

Description
2015 three CD collection from the world-famous Trinidadian and Tobagonian British recording artist best known in the U.S. for his string of '80's hits including 'Caribbean Queen (No More Love On The Run)', 'Get Outta My Dreams, Get Into My Car', 'Suddenly' and many others. This 50 track collection features tracks from his throughout his career that began in the '70's, a period which made him a star in Europe before he set his sights on America.

Tracklist
[CD1]
1. Love Really Hurts Without You
2. L.O.D. (Love On Delivery)
3. Cream On The Top
4. One Kiss Away
5. Stop Me (If You've Heard It All Before)
6. Mr Business Man
7. Tell Him To Move Over
8. Sweet Memories
9. (Let's Put Our) Emotions In Motion
10. You're Running Out Of Fools
11. Red Light Spells Danger
12. Everything's Changed
13. My Love
14. Maybe Tonight
15. American Hearts
16. Are You Ready
17. Stay The Night
18. Everlasting Love

[CD2]
1. What You Doing To Me
2. Nights (Feel Like Gettin' Down)
3. Another Day Won't Matter
4. Calypso Funkin'
5. City Limit
6. I Can't Stop
7. Inner Feelings
8. Caribbean Queen (No More Love On The Run)
9. If I Should Lose You
10. Lucky Man
11. Loverboy
12. Mystery Lady
13. The Long And Winding Road
14. Suddenly
15. Showdown
16. When The Going Gets Tough, The Tough Get Going
17. There'll Be Sad Songs (To Make You Cry)

[CD3]
1. Love Zone
2. Bitter Sweet
3. Love Is Forever
4. Without You
5. It's Never Too Late To Try
6. Get Outta My Dreams, Get Into My Car
7. Calypso Crazy
8. Let's Get Back Together
9. The Colour Of Love
10. Tear Down These Walls
11. Stand And Deliver
12. Pleasure
13. License To Chill
14. I Sleep Much Better (In Someone Else's Bed)
15. Pressure

Amazon USA
https://www.amazon.com/dp/B00PN9XRZS/?tag=imwan-20

Amazon UK
https://www.amazon.co.uk/dp/B00PN9XRZS/?tag=imwan-21

mr. ocean has about 10 studio albums.
with filling-up each disc from a 3CD set, that's probably about 2/3's of each album.
or... as the kids like to call it: "overkill."

The following tracks appear on Greatest Hits and Ultimate Collection, but not here:
Here's To You (1988)
Everything's So Different Without You (1993, #91 U.S. R&B)
Can We Go 'Round Again? (1993)

Taking into account both US and European reissues, are there any previously unreleased songs on here, or new-to-CD recordings?

To answer my own question above, I compared the track list with all my B Ocean CDs and the only thing that seemed semi-unique was:

Let's Get Back Together

But it's on a 2003 UK compilation of th same title, which also seems to have 3 other unique songs that are only on that compilation. So nothing new here.