[Big Poppa Smurf]

Jesus Christ there are a staggering amounts of retards with no reading comprehension in this thread.

OP,

let your boss handle it and deal with all the stress. I wouldn't worry too much about getting this $18 back though, your boss sounds like a good guy and hopefully he'll take care of this. To me, the $18 this one time would not be worth the hassle of getting it fixed (but I am used to having to fight for months to get pay issues fixed; if it will be really simple for you then obviously get your $18).