Doubting if one perhaps purchased stolen sugar cane

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?