Why am I not surprised that tri boy & plain red girl are the two who are completely in the fridge?? I'm surprised the red one with the question mark wasn't trying to shove tri boy out of the way.
Keep in mind, unless you correct them "in the act" they really have no clue that they have done something wrong, or more to the point "what they did wrong"…. shredding is pretty natural to a Basenji
Arrrgggg technology! Here's another attempt:
http://www.flickr.com/photos/58136979@N03/5429455987/
If it doesn't work, it's her chewing on a huge bully stick.