Lost and Stolen items

Q: I took/stole some money when I was much younger and I am not sure whether I took zakaat or lillah money. Now when I am going to put the money back, what must I write on the envelope (because I'm not sure what money it was).

Q: I am 16 years old but I just wanted to ask about something. I have found money in my cupboard and I can't recall having any money or having put any money in my cupboard , it caught my eye. But I thought to myself maybe it is mine and a week later I bought something with it. I don't know what to do now? I am afraid to own up and say what I did and ask if it was anybody's here at home. What do I do about the money I used? What do I do with the change? Can I give it for sadaqah or can I maybe give it to one of my family members, maybe even my mother who might be in need of it?

Q: I am a student in Malaysia and I am doing a PHD here. Once I came to my workstation in the Lab I found a mineral water bottle on my table and then I asked from my lab fellows sitting around me. No one knew about it. Please advise me according to Sharia what should I do with this water bottle?

Q: Please I would like to know how to reimburse money that I have stolen from somebody and how about money that I have borrowed and the person cannot be found anymore?

Q: I went to Nizaamuddeen markaz to attend a mashwara. One brother gave me a pen to me to write. After sometime I forgot to give the pen to that brother [even his face also I don't remember now]. Give me a solution, what must I do?

Q: I own a shop. Sometimes, when people buy goods from me, they leave it in the shop and don’t collect it. Is it permissible for me to re-sell those items?

Q: I do transport for a company that does packaging for various other companies. I do not know the details of their agreemants. I was given a bag of products from the company as they were moving warehouse. Also the balance of the products were returned to the companies for whom this company offers their services to. Can I use these products or is it better to return them?

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.

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?

Q: I work in a shop. Sometimes, customers forget their change and sometimes also forget their purchased items. What should be done with their change and items?