I have old Bitcoin Core wallet files that I remember possible parts of the password, I think it was encrypted in 2013, and that it was likely (but not 100%) without special character but including numbers. So the password might be crackable, also it was most likely in Chinese (probably simplified but maybe pinyin). I know that that is BTC and not BCH, but because this is the BCH sub I will pay the bounty with 708 BCH if the wallet is found.
The way you have to do crack this is by using the extract scripts here which will be enough to get the wallet.dat password, BUT not enough to steal the BTC in the wallets. It just contains the encrypted master key and some other info.
I have a total of more than 10 wallets, totaling to about 100 BTC. So you'll get 20% of each wallet you crack (converted to BCH for reward) See it as the hunger games as I'll let anyone with good rigs or chinese dictionary work on it!
But I'd like to start with one first. If you can do this, message me about your chinese password dictionary or what you can do. Don't bother messaging if you have a poor computer/GPU, it will take years!