Another floor decision

[haakee]

Lucky Chances 10-10-20 no limit game. I am a new player and post a "kill" in the CO. Limping is not allowed in this game and my kill is $40 making it 80 to go. I have cash on the table (which doesn't play) and am waiting for a chip runner to convert it. I'm last to act preflop. Folded to me and the dealer asks for my action. I tell her it's killed and I act last. Button and SB fold and the BB grabs his blind and throws his cards into the muck apparently unaware that I had posted. I point to the cards still in front of me, ask for the $40 in blinds, an argument ensues and the BB requests that the floor make a ruling. What should it be?