What to do with these treasures?

Cherie. You could use those to house all of your precious pictures of family and friends. You can get spray paint and have some beautiful boxes

I would paint them on the outside and remove the lids and then use them as planters. The one in the front of the pic might be a good size for a window planter, its hard to tell their size from the pic tho and I could be way off.

you could remove the tops (or keep them) and hang them on your walls With the bottoms against the walls or remove the tops and use them as storage containers under coffee tables, in the mud room, under benches, etc.... they could also be sliding drawers in converted furniture. Good luck!

Out door cooler comes to mind. Good for storing ammo also

I'd spray paint them white then rough up the edges a little. Then mount them side by side onto a white weathered board and hang them in my shabby chic craft studio to store yarn, fabric, paint brushes etc.

Great find!

A gun safe comes to mind. If you have the key, one of these boxes should be secure, easy to store on a high shelf and easy to get into. Paint or cover it to disguise it if you wish. And use the others for planters.