I was in the area today setting a new multicache and took the opportunity to check on a few of my SB1 and NB1 geocaches. "NB1 - Before Radar" was missing. Rather than simply replacing the geocache, I took the opportunity to Refresh the Gameboard by setting one that is just slightly better, that is if you think that a bison tube is slightly better than a pill bottle.
In any case, it's a posted bison tube.