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