fwiw, more than once I have used EEOs on bookings where the publicly available rate was a promo rate that awarded a GC (iirc, the Amazon GC & Visa GC promos).

I've always gotten the promised GC & EEO discount but iirc, only one property, the Boston/Peabody Marriott questioned me. However, that was because they claimed they had never seen an EEO cert & denied it was real.

From the new EEO list, I see, that property is now officially not participating in the EEO offer.