Missing Home Work Book

Kath is off-school today. I mean I didn't send her to school as she lost her home work book since last week and I had been looking around the house but hasn't find it yet. I am not sure where it is exactly but one thing I can think of is, my son had probably put it inside my balikbayan box before it was shipped to Philippines. If it is, then there is no way we can get it back. I just have to bite the bullit and ask the teacher for a new one.