what did Keita lose in the dark desert?

I remember one particular trip on my holiday. It was going to the Tottori Desert. I went there with my club friends in my car. And we left my country in the morning and we arrived at the midnight. It took about 12 hours!! Though they didn’t help to change driving with me during car drive... So, when we arrived in front of the desert, I was really exhausted and it was very dark and cold. But we decided to go there soon, because they were very fine and excited to see the desert. And I didn’t want to be alone so I followed. I had a camera and my car key so I wasn’t carefully to drop them. But I had to run because I had to catch up my friends. And I met them after a few minutes. But I lost my camera and key while running!! It was so dark in the desert and I couldn’t see anything. Because if we couldn’t find my car key, we couldn’t go back to our home town!! So we looked hard for it. A few minutes after I could find it in the dark!