With regards to MJ's RIAA certifications for singles, the MJ estate is still behind. They have started to catch up in the last couple years but there's still WAY more work to do.
As of today MJ has been certified for 68.5 million singles sold in the USA. He is the 22nd most successful artist in this regard, and the top selling musical act of the 20th century.
I have went and done some deep research on what still needs to be certified. There are 9 songs that still need to be certified (Scream, Heal The World, Leave Me Alone, Who Is It, Give Into Me, Jam, Ghosts, Speed Demon, Slave To The Rhythm). All of these songs are currently Platinum or Gold, for a total of 7 million units sold. None have been certified yet.
In addition to the songs listed above, there are another 12 songs that are currently under certified. Some by huge amounts. There are 31 million missing sales from these 12 songs. The top 7 are:
Smooth Criminal (8X Platinum)
They Don't Care About Us (8X Platinum)
Man In The Mirror (5X Platinum)
Love Never Felt So Good (4X Platinum)
Bad (4X Platinum)
The Way You Make Me Feel (4X Platinum)
You Are Not Alone (3X Platinum)
If the estate were to invest the time, they could add an additional 38-39 million single certifications to MJ's total taking him to around 107 million. This would take Michael Jackson from #22 to #9 (ahead of The Weeknd, Post Malone, Bruno Mars, Lil Wayne, Ed Sheeran, Lady Gaga).
To put into perspective, there is not a single act from the 20th century in the Top 25. Singles just didn't sell back then. The fact that MJ is competing and actually beating the majority of modern artists with single sales is simply mouth dropping. Try to encourage the estate to finish his certifications.