Lost shiny silver stainless steel bento lunch box with green silicone strap and small dent at Lake Siskiyou.

I misplaced my stainless steel bento lunch box while having a picnic at Lake Siskiyou last weekend. It’s shiny silver with a green silicone strap, and it has a small dent on one side. I remember placing it down on the picnic blanket but forgot to pick it up when we left. I’d really like to get it back as it was a gift from my sister.