If I lived close by I'd take your boxes--since I sell stuff on ebay I always need boxes. If you broke down the boxes and put a "come and get it for free" ad on craigslist/facebook, left them on your street or by your garbage I bet someone would come and get them right away.

Why not call the workers you allow in your home and let them know they will be required to wear a mask. Not up to them...up to you.

The play area you made is fabulous!