We found this box in New England. At 18" wide, 10 1/2" deep and 9 1/4" tall, it was likely made to carry a transit or similar instrument.
The case is oak with the original green painted surface. The tool marks and construction suggest it was bench made. It is nailed construction using 19th Century cut nails. The straight shank hinge screws are pre-1845.
The top handle (likely leather) and lock plate have been removed. Marks on the upper sides and top suggest there was a shoulder strap as well. The hinges and mortise lock are original (the key has been lost).
The hinges are marked "Gruk;s" and we have been unable to identify the mark. It is possible the case and contents were German.
Nice color for that stack of boxes in your family room!