Getting a gift in the mail

I've been working with the kids on certain key areas. They have charts and each time they do something on the chart they get to put a sticker up. Their chore list includes: Sleeping in their own beds, helping with the pigs, picking up their toys, and brushing their teeth. They both have over 10 stickers in the sleeping in their own bed category and to celebrate Grandma sent them a little gift in the mail.