I have a runescape account with bitcoin from 2009. How do I access it?

Backstory: Someone in runescape was offering “bitcoin” that was digital gold and would one day be worth millions of dollars. I immediately was walking by the guy in game and it caught my attention. After talking to him for a few minutes it made me realize that I might as well get some. He gave it to me for a fee in-game items and I remember he gave me bitcoin to me for free on three seperate occasions because I told him how poor my family was. He told me to save the wallet keys and to give it to my family and have them store it and to sell it in the future

Unfortunately I didn’t really think much of it and I ended up forgetting about it. Recently my brother started playing runescape again and it dawned on me which account has the bitcoin on it.

I tried to login “Password Incorrect” After 10 more attempts it I realized I dont know the password I kept as a kid. It made me realize that this was a terrible terrible thing to happen. I believe I could have quite a bit of bitcoin on there. I tried account recovery through jagex and failed

I have been trying to see if there has been a data leak of runescape usernames and passwords somewhere since that would help me recover the account.

If someone were to assist me in getting the password by pointing me in the right direction by finding these data leaks for runescape accounts and I do recover it. You can bet your bottom dollar you will recieve a decent amount of bitcoin from what was on there