Condition Silver

I have a star note silver certificate, series 1957 in good condition. How valuable is it?
I work at a supermarket and today I found a series 1957 silver certificate in the register with a star next to the serial number. It is in pretty good condition, and I know some about US paper currency, but what I would really like to know is how much it’s worth considering its crispy, unworn condition.
here is the question, where has it been.U.S curency is pulled from curculation about every ten years and burned. This may be stolen from someones collection,These bills are still only worth face value.
GREAT CONDITION SILVER 2003 TOYOTA 4RUNNER SPORT EDITION $17995 65K MILES N6308P