Have a listen... This physical task has now been taken down. At the location given by the sounds, there was a note with the text "fortuitous".
In the background of the guards conversing, a conversation through the use of tap code is on going. By listening to the taps and deciphering it, you get: "met" "y" "whr" "w prk lot nw lmp pst" and "rgr". If you go to the arranged meeting place, the West parking lot and go to the Northwest most lamppost, a note was posted on it saying fortuitous, which is the password.