The cache is a magnetic mint tin and it is not hidden at the listed coordinate.
The cache is hidden at
S31 (Wednesday/Sunday)(Tuesday/Friday).(Sunday/Thursday/odd)(Monday/Friday/even)(Sunday/Thursday/odd)
E115 (Tuesday/Saturday)(Wednesday/Saturday/even).(Monday/Friday/even)(Friday/Monday/odd)(Wednesday/Sunday)
The magnet is attached to the metal not the cache so retrieve with care. There is often very little parking close to GZ during working hours, although after hours there is often plenty of parking. A few hundred metre walk will be required unless you ride a bike in which case you will have direct access to GZ.
You can check your answers for this puzzle on GeoChecker.com.