Answer:
Everyone has me except for a few. You may not be able to identify me but I can always identify you. What am I?
When you need me, you must find me. When you find me, you no longer need me. What am I?
Although it sounds like I work on a transportation device I actually work in a restaurant.
Package beneath a tree, inside a tasty treat. Keep it for a month, the taste is just as sweet. What am I?
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
No matter how little or how much you use me, you change me every month.