I don’t know the answer to your original question, but those ebay prices…what a joke. $200?! Come on! They were slow sellers at normal prices when new!
I’ve had good luck finding out of print RR books on AbeBooks. There are a bunch of the Atlases listed there now at rational prices. Abe is used by a lot of used book stores and thrift/consignment type stores. Avoids the “unrelated eBay search result” problem.
White River was selling them after SPV ceased publication. I don’t see any left there now.