I have around 10 or so hand-made toolboxes for sale, strong enough to support at least 200 lbs on any side besides on the handle. Edges have been sanded, and screws have been countersunk.
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$10 each, not all of them
Please text me if you're interested so I can give them a once-over on sanding and countersinking.
Only available in the size shown, but can make more if needed to.