Don't believe ANY of the above!
Regarding the mattress/box spring mix and match sale...
The reality is that their are two alien species in contact with Earth.
One group of Aliens are invertebrate (they have no spines), therefore they desire the comfort of a VERY soft mattress, which they beam aboard their space vessels from random Sleep Country outlets. However, they only like blue or grey coloured mattresses!
The other group of Aliens simply prefer sleeping on an extremely hard surface. They also target Sleep Country outlets, only they are looking for box springs only. Coincidentally, they only like pink or beige box springs, which they also beam up to their space vessls.
Therefore, every 6 months or so, when Sleep Country does a store wide investory, they discover they have an inordinate number of blue/grey box springs, with a similar number of pink/beige mattresses. This is why Sleep Country regularly offers their mix'n"match sale!
As for how they get the caremel inside the Caramilk bar...caremel is as valuable as GOLD to both Alien cultures. They beam the caramel inside bars of pure milk chocolate as payment for the mattresses and box springs they teleport away!
Nicole, hope you enjoyed my theory, do I win the prize for creative writing?