Lost and Stolen items

Finding money on the pathway

Q: Few years back when I was going home from office at night I found Rs.100 on the road. I was not so much aware of the Islamic path at that time and I spent the money on myself. But now I feel its a big sin and its hurting me and making me feel guilty. Please guide me what should I do now. May Almighty Allah bless us.

Stolen wealth

Q: If a person stole money from a person then another person stole from the original thief, Islamically does the thief get compensated in the next life?

Doubting if one perhaps purchased stolen sugar cane

Q: While passing through one of the farm towns, a guy at the garage was selling avokados in a bag. When I bought that, he offered me suger cane as well. Only after I bought it and returned home, did I realise that he only had one sugercane. So I perhaps thought that why was the avokados in a bag which he had lots of (in different bags), but he only had a single sugercane. I perhaps thought that maybe he got the single sugercane by walking past one of the farms and taking it with out paying for it, which he sold to me. What should I do in this case, if I doubt that the sugercane was perhaps stolen?