Lost and Stolen items

Returning something to the rightful owner

Q: Thirty years ago, when I was a child, I found a gold necklace. My sister took it from me and kept it. Two months ago she returned the item back to me saying she is not entitled to it. The local police law states that if you find something you must hand it in to a local police station and if no one claims it within 28 days then it becomes legally mine. I handed it in to the local police station and no one claimed it. I couldn't say I found it thirty years ago because I might have got into trouble for keeping it so long. Obviously no one claimed it so the police have said I can keep it. I don't want to be sinful so what should I do with the necklace?

Warning someone about being deceived by a certain person

Q: I have given some money to a person who promised me to give me back on Wednesday but he didn't, then he promised to give me Friday and he broke his promise again. Likewise it is more than a week now and I still did not get my money back. I fear he might have tricked me to take money from me and he actually didn't need it urgently.

1. My question is that he also knows my brother and he may ask my brother for money as well and he do the same to him. Can I inform my brother about this so that he is aware of the situation and he does not get tricked?

2. If I complain to my brother about him then this will this be counted as back biting (gheebat) and I should not tell my brother?

Driving away after knocking someone's car

Q: I have a small problem. This morning I went to do some shopping. While parking, I misjudged my turning and by mistake I scraped into the car next to me. It was a very small scrape, maybe just a touch up would fix the problem on their car. Due to my financial situation I got scared and drove away without informing the person. However I am now feeling really really guilty about it and i fear Allah's punishment with regards to it, like I am scared Allah will take away barakah from my wealth that I have left or something else will happen. What can I do to fix this situation as I was scared to wait for the person to tell him what had happened.