Word Play

I had a terrible day. Being around grown-up Americans has spoiled me so much that I almost broke out in tears in front of my fourth graders today.
Anyway, I was immensely cheered to discover in my mailbox four envelopes from home, each containing the following: one granola bar, one scratch-off lotto ticket (I won a dollar!) and a scrap of paper with a letter on it. On the back of each letter, a notation saying “5 of 20,” “12 of 20,” etc. So some sort of secret message. So far, I’ve got:
_ _ _ _ o _ _ _ _ _ _ e _ _ _ _ _ p o _

Any guesses? I’m pretty sure it’s multiple words, and I’ve no idea when the other clues will come.