I had this same scenario happen a couple of days ago except, immediately after the instant book came in, (with no message from the guest), it said the account was removed for violating Airbnb's terms. The reservation was still on my calendar with a confirmation. Yesterday afternoon I was able to send the guest a message asking "what brings them to the area" as I'm uneasy with a booking where the account is brand new, was removed, never sent a message, and now the guest hasn't responded to my message. I messaged airbnb support and they completely ignored the part about the account being removed but told me I would get my money and I could call the guest. I'm trying to decide what to do......