Lost: a brown notebook with a green rubber band near Kite Beach

Did anyone find a small brown notebook with a green rubber band, near Kite Beach on Saturday morning? The first page is a column of figures I could not rebuild from memory. I know, I should have taken a photo of it first, and I am embarrassed about that. It is only my monthly spending notes, but it took a long time to write up. I will check this board again on Sunday.