Even if they ever dig film reels out, it's another issue if they find them all.
(Just like Jesta wrote, in Queens' case there are even some releases where songs are not completely).
Locating, developing/digitalising, restoring, cutting, etc. etc. Film reels are not like a HDD where things might be easier to handle.
To give an example what's my film reels vs. HDD-recording is about:
35mm film is capable to produce Full HD image and higher (1080p+).
1 reel of 35mm film can capture about 11min. (standard size for a 35mm reel is 305 meters, which is ca. 11min. at 24 fps, by duplicating the framerate the length of capturing is halved to 5min. 30sec.). Afterwards the reel has to be changed. So every 11 mins. the reel of each recorder/camera has to be changed.
At a concert of 2 hours this means ca. 12 reels per camera. If they captured the concert with let's say 5 film cameras (1 in the middle of the venue, 2 right in front of the stage, 1 on stage, 1 crane) this is a total of 60 reels for one concert. 60 reels have a total length of 18,300 meters (18.3 kilometers!).
Remember this estimation is for 24 fps, if they recorded with 50 fps the amount of film reels is ca. twice as much.
1 meter 35mm film = ca. 2.2 sec. at 24 fps or ca. 1.1 sec. at 50 fps.
They need to find all of them, if not songs might not be in full. Maybe they changed the reels after every single song which produces of course even more reels than my estimated 60.
So when they finally find all reels they can start digitalising. Nowadays developing 1 meter film reel costs ca. 1.20 US-$/meter. Sure a company like Sony can do it themselves or get better deals. This might be the cheapest thing (I guess Sony would pay much less than 20k US-$). Then starts digital restoration, cutting and editing, audio etc. etc.