Where have all the pens gone?

I need to write a cheque for the long suffering Orange Juice man. I thought I was using a pen but it was a pencil disguised as a pen! I have found 4 lead pencils in the last 5 minutes, which of course never happens during the school term when someone is trying to do their homework and needs a pencil. Where have they gone? Maybe the Orange Juice man will have one on him in the morning.