Funny story - I reached out to Zerkles a couple of days ago, based on this thread, just to get some more information on Russian Rat Snakes. There's not a ton on the webs, and Youtube is hit & miss on their husbandry requirements. Anyway, they PM'd me today several times asking for my address and phone number for the shipping label. I was like, "whoa - i know I'm dreaming about this snake, did i sleepwalk and order one unbeknownst to my conscious self???" I let them know there must be a mix-up, and they figured it out and said wrong girl, this guy is for Fiona.
I'm assuming you are that Fiona. I almost got your snek!!