I'll Take What's In The Box

Are you familiar with Runnells Bridge in Hollis, N.H.? This bridge spans the Nashua River just over the Hollis town line where Route 111 intersects with Depot Road. There is a beautiful place to fish under and just downstream from that bridge.

I have been out over the past few days taking photographs of our frozen environment. Yesterday I made a trip to the underside of Runnells Bridge to see what the Nashua River had to offer for sights and subjects. It was there, not far from the river's edge, that I found an oddly placed wooden box. Today, I went back for a second look.

 Can you help me identify what the box is and perhaps why it is there in the forest along the Nashua River? This box is approximately four feet long and perhaps 18-24 inches wide. It appears sturdy and well-crafted out of quality inch-thick plywood. There is what looks like a partial top or lid placed nearby along a fallen oak. The lid is made from the same material. Between the lid and the box is a shallow hole that fits the box quite precisely as if it was dug for the box or was possibly created by the box being dropped from a considerable height to its current resting spot. From initial inspection, the mystery box only contains leaves, twigs, snow and ice.