The cache is not at the posted coordinates. Do not go there.
Although this cache is available 24/7, it is not recommended at night.
This is the bonus cache to my adventure lab Hamtramck - Following Polish Footprints.
At each of 5 locations of the adventure lab you should have received a code letter. Enter these 5 letters in order into the Certitude geochecker to receive final coordinates of this cache.
I hope you enjoy it 
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You can validate your puzzle solution with certitude.