What version of electrum did he have running? Also, you should be able to go to file and see recently accessed wallet files from there (in case he had multiple and you can only find one specifically). If you meant you found an electrum folder that was empty, you could also try searching for a name like "default_wallet", "wallet" or "wallet_1".
Have you not also got access to his emails if he did pass away so you can see if his funds are on an online account that was his (ie search for "deposit" or popular exchange names where you are).
The chances he actually had 50000 btc are extremely slim, it's not impossible but it's more likely to be a lot smaller than that - it might have been a bluff too.
Well the last modification to the folders was around 2019, but that could not be possible as the computer was not working around that year, I think it was around 2016-18 when the pc was busted, so it could be any of those versions, and I just searched for wallet and I didn't find anything good.
HardDrive\ProgramData\aaQgoNINpzpuIQX\Files has some stuff
There's a txt file containing alot of passwords for different accounts, even some super old google accounts I can't easily access at the moment. Cookie files as well. There are some other txt files that aren't crypto related like minecraft logs and some other stuff. This was all found from the program data folder