Update: the two with lids sold for $20, the remaining drum painted grey with no lid is $10
See pictures of these 10 gal steel drums that have been cleaned and painted. The plastic 5 gallon bucket is in the picture to provide scale.
I believe they originally were shipping containers for large nuts and bolts for use on an industrial level
You decide their next use, strong and sturdy, they would be great for a contractor or whatever else you think of.