I'm on Shadowlands, and no one bought the damn mask. As for the mounts, they have been on my inventory since DECEMBER, and they were still not puttable on the GTN.
Funny I listed 3 vehicles up on there today, and I know I have bought a few off there too.
I highly doubt you tried to sell a Revan's Mask on The Shadowloands GTN for 50k, and it didn't sell. As a matter of fact, I know that would be false. The current one I saw earlier today was for 3.5 million. 50k would sell within a minute of posting.
If you get a Revan;s mask again, just save your time and give it to me. As a matter of fact, i'll give you 100k for it.