Writing a report when you lose something in somewhere.

I am writing this report because on the last 2th of November I lost one of my shopping bags that I was carrying. That was at 20:00 approximately. I spent all day on in the shopping center looking for some presents for my parents because they will celebrate their anniversary next month so I thought that would be a great idea to buy some presents.
Well, at the last end of the day I went to the train station, I took the train number 2352 which stops near to my home. It was quite empty so I seated sat next to the main door. I putted put my bags next to my legs and then I switched my mp3 player on. At that time I had 4 shopping bags. When I realized that I had only 3 bags was when I was opening the front door of my home,I realized that I only had three bags when I was opening the front door of my home! So I came  went back to the train station but obviously it was too late, the train had already gone.
The bag was mostly brown but had some red thick stripes and belonged to a famous jewelry store because as I bought a light, shiny necklace. It was not so expensive <but when I saw through the store’s desk, it is because that I am so sad about all of this.> - not sure what this means
Finally I would appreciate very much if anyone who finds my bag would contact with me.

Thanks!