They are very clear on the web page and on all the documents that they send out - fi you need to contact them, call. They admit that they are not very fast about returning emails (if ever).
This is true. I got some Rose Comb Rhode Island Whites from a gal who got them from Sand Hill. I called and emailed Sand hill to see if they knew of a line these birds may be from and I never heard from them and this was a few years ago.