Quoted from Jigz:
I would probably reach out to Spooky - they seem to use that same lock on most of their games that I've seen. My Rick and Morty and Scooby uses the same F04.
Thanks for the tip. Spooky support has always been great. Turns out I already tried that, and support suggested Pinball Life to get parts (I also need to replace the coil for the shooter). They didn't provide specific locks just that I should try, just that I should consider buying parts from them. Cool to find out that Pinball Life carries the spooky coils though!
As it turns out this cheesy $25 lockpicking kit I bought on a lark from Amazon arrived just after I posted this. The lock was a little tricky to pick because it's a 'double bitted' wafer lock and I have zero experience with lockpicking... but I sat there watching youtube videos and trying various approaches for like 30 mins. Just when I was going to give up I managed to get the lock to turn!
Pretty exciting. It took a ton of force with a wrench to get the nut off of the lock once I was inside but I was able to replace it with this 'keyless coin door lock' I had bought with the other Spooky stuff from Pinball Life and it works great. Much better outcome than having to drill it out and clean up a mess inside.
In case it's helpful, this part here at PL is for sure the same as the backbox lock and the key it came with worked on my backbox: Williams/Bally Backbox Lock & Keys Only - part # A-13379_LOCK . $4.95 . So if you want some extra backbox keys, maybe grab one.
And the keyless lock I replaced my coin door lock with is this one, in case anyone's curious: Keyless Coin Door Lock - part # THUMB_LOCK . $3.95
Thanks everyone! Now to get to fixing my machine. The movers managed to damage it so it's been out of commission for nearly a year, hopefully with the new shooter coil and a new board it will be working again soon enough. I still haven't had a chance to try the cool challenge mode they added!