Boco, I like seeing the reference to whiskeyjacks, when I moved up here nobody knew what I was talking about. They are camp robbers up here.
Official names Gray Jay, Canada Jay, or Whiskey Jack. We hunted with an older native fellow when we were in our 20's. He was so confused as to what to call them, that he called them "blue jack whiskeys". I have always called them Whiskey Jacks also. Camp robber is also a common term here.http://en.wikipedia.org/wiki/Gray_Jay
Lot of boxes for back packing there Brent. Wish you luck with your marten trapping and hope you post some pictures of your success.
Yes sometimes critters dine on the plywood boxes: