Which novels in particular? The X-wing novels (Rogue & Wraith Squadron both) were some of my favorites outside of the Thrawn/Jade stories.
I found the third book of the Thrawn Trilogy - no idea where the other two went, and frankly the third is in such bad shape I’m pretty sure it’s not long for this world either, but only having the third doesn’t bother me because I used to have the WORST problem with accidentally buying second and third books of trilogies (back in the days before smartphones and the ability to stop in barnes&noble to look up the book you’re about to buy), so The Last Command is the one I started with anyway. Oops?
That, and the Han Solo Trilogy, of which I found books 2 and 3. Apparently I’m just cursed to never be able to read the first book of anything ever again. /sigh
I never got into the X-wing novels myself. Got one from the library and I think only read a little bit of it. I did read the first few of the Young Jedi Knights series back in the day, but I didn’t love them enough to keep them. Ah well.