I have to go with "both in on it together." Just as a very loving Heavenly Father and Lucifer pranked Job with plagues of boils, killed his animals and all his sons and daughters just to settle a fun bet, Jesus and Satan made a bet on how many Mormons would search the bushes for cans of beer that didn't burst and slip them into their pockets. Who says they can't be fun?
"Hi Brother Jones. Is that a Budweiser in your pocket or are you just happy to see me?"