Metal Box of some type

[FrankTM]

Found this near a CW battle. The area turned up some square nails, but not anything definate CW. I have no idea what it is. It has a hinge part also. Next to the pin is the hinge piece. I found several more pieces with this, but nothing to really help id it.
Frank

 

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[FrankTM]

Here is a close up of the hinge.