I've been looking at the Ebay listings and have come up with my own opinion about how they are listed.
HTF...They are in your pocket with your keys and chump change and you're going to have to turn your pocket inside out to find them.
VHTF...They are in your backyard and you lost them. Or they are buried in your couch and you can't get to them without destroying your couch.
ETF ( Easy To Find ). Those are the ones you dropped on the floor and stepped on.