FWIW, I put in my school name and grades I teach when I ordered. They called to verify the information I had given them was correct.
The supervisor I spoke with after they canceled part of my order also mentioned the "federal regulations" for selling to homeschoolers. I had to bite my tongue to keep for asking her for those statute references. She also said I could only join their book clubs if I was a "legitimate homeschool". I almost lost it with her, but I figured that letting homeschoolers have the good teacher discounts made it worth it to keep my mouth shut (I guess I have a price and it's $2 Magic School Bus books, lmao).