Lost Christmas Present

You are an elf working for Santa. You like your job and do it with love. Christmas is coming and with a horror you notice something: one present is missing! That's terrible, how could a child be left without a Christmas present? You need to find it before it's too late. Merry Christmas people. I came up with idea for this scenario after I saw a similar plot in a cartoon, but I can't remember how it was named.