Paragraph 1: Say what you are thanking the person for and how you found it. 

To the person who found I help you find your wallet

Paragraph 2: Say what you were doing when you lost the item. 

I was very hsppy when stopped going tho the hospital admitted.

Paragraph 3: Say why the item is important. Give some personal info or opinions. 

It's very special to me soccer because it makes me forget all the bad things that happer to me at home and I’m very happy.