They kept the 1993 Laserdisc masters around. And Fox may actually own the video master. It’s technically not even a Lucasfilm production.
Lucasfilm does own it outright now, since May 1989 at least. They bought the rights from CBS and transferred the copyright over. But while they probably have at least one master copy, the condition of that copy is unknown - it may not be in great shape after all this time. I’m assuming they took the Boba Fett cartoon that’s on the Blu-rays from a master copy and cleaned it up as best they could.
–SKot
Haven’t watched the Blu-Ray version in a while, but I swear it looked like it was taken from something s few generations down from a broadcast master? (They also windowboxed it into a smaller image?) The vintage documentaries look even worse, and those could have been transferred off the original film elements had they been willing to spend some money.
I still wonder if the film for the Boba Fett cartoon even exists anymore. Nelvana lost a bunch of stuff in a fire that also destroyed the alternate version of Rock and Rule. A surviving video tape copy was used on the DVD and Blu-Ray extras.