If you only got one as a gift... you were cheated. They come in pairs and are offered with a free book light. (with additional postage and handling fees applied)
2 snuggies + 2 booklights = a complete gift.
What you have there is a re-gifted gift.
I would kick the giver in his/her naughty bits.
you're right, as soon as my daughter gets home i'm kicking her ass.