The envelope of unexpected Wealth

"I was standing outside a small shop when a man I didn't recognize walked up to me and handed me a thick envelope. He said it was money that belonged to me. I asked him why, but he just smiled and walked away. I opened the envelope and saw so many bills inside that my hands started shaking. I remember feeling relieved, like I had been worried about money for a long time, even though I don't know what I was worried about. Then suddenly I was at home showing the money to someone, but their face kept changing every time I looked at them. I started counting the bills, but the numbers wouldn't stay the same. Every time I reached the end, there were more. I put the money in a drawer and closed it. When I opened it again, the drawer was full of coins instead. I woke up still thinking about the envelope and wishing I could find it."