What mounting hardware do I need to install this?

Mounting hardware is not included with the box. You'll need to source fasteners appropriate for your truck bed style—most installs use bolts or clamps depending on whether your bed has tie-down points or welded rails. Test-fit the box on your bed before committing to a fastening method.

Can I paint this aluminum box?

Yes. The aluminum surface will need light sanding and a primer coat before paint if you want a finish that lasts. Strip any factory coating, prep with fine grit, prime, then paint with an exterior-grade enamel or powder coat for best adhesion.

Does the lock work if the key gets lost?

Once locked, you're committed to that key. If you lose it, you'll need to cut the lock or drill it out—there's no master key bypass. Keep your key in a safe spot or consider making a spare before you need one.