Need Advice from the Pros!

Your best bet would be to haul them to a scrap yard. They’ll certainly rake in a few bucks, given that there are quite a few of them.

Something to think about before you sell or scrap the lockers. If they have numbered tags remove them and consider selling on eBay. The tags alone sold in lots of about 20 may have more value than what you could get for scrap. If they are brass tags maybe even more than steel tags, may depend on condition and how fancy the tags are. Search completed listings for numbered locker tags, Steampunk brass tags etc. and you will get an idea. Good luck, hope you can get something decent out of the old ones to help fund the new ones.