A John Deere auction in Ottumwa isn't surprising considering that John Deere makes hay balers and mower conditioners there. I used to visit the JD Ottumwa Works about once a month back in the late 90s and early 2000s. We were even "Supplier of the Year" there a couple of times.
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I'd like to make a suggestion. Take up the offer for a known steel! Put your mystery steels in the corner for a few years. Pick one and only one, good, simple to work with known steel and learn on it. You'll have much more success. STEEL IS INEXPENSIVE! For a $1 investment in a good, known steel you can make a knife. The handle material and the time is the expensive part of making a knife. Why spend time on mystery steels, until you understand how to work with them?