Its been quite awhile since I had something like this happen and I cant recall what the AirBNB procedures are in a case like this.
I had a guest book for two people for about a week, two ladies showed up and said the place was wonderful after staying a week. On the very last day, the woman staying in the house admitted that she was not the woman who made the booking but actually a friend who had been using the account while she looked for apartments.
They left and gave no cause for concern but then the woman who operates the account (and never actually stayed in the house) left a low star review (but didn't say anything negative in the comments). I don't require guests to show IDs (never have) but recall a year or so ago reading about how people who never stay in the house aren't supposed to leave reviews. This also strikes me as on very shaky ground with the 3rd party booking rules, but since I don't require IDs to be checked, I'm not sure.
Postscript, in a final thank you message from the guest, she admitted she had given her friend access to the account so there is a record over messaging that she never actually stayed in the house.
Has anyone had a similar experience?