So, I never did post my theory:
"Take a Mafioso Fishing Day, 2008"
This is the result of emptying a bait box after trolling for Six-gill Shark in the Straits of Georgia. That's why there was only one left, and of course we all know that Six-gill prefer the left foot. This explains why only right feet had been found previously, which troll with a counter-clockwise rotation, vs the left with their much more enticing clockwise rotation.