Auburn Police Find Interesting Note On Door

The Auburn Police Department recently made a stop for one reason or another.  They were greeted with a note that read 'Nock hard but not like you the police'.  Humored by this, they posted it to their facebook page with a this response: Apparently we have a tell tale knock?? Might be time to change our knocking techniques to keep them guessing?

I'm curious if anybody was home.