Rebecca has been dealing with a client who is seeking to purchase a large property. Sally has asked the client to provide evidence of his income. The client has brought in bank statements showing regular and significant winnings on gambling bets. The client has stated that his passport was lost in a house move. Sally has now checked the property that is for sale. The property appears to be grossly overpriced for the area and on advising the client of this, the client stated that they wanted to pay the asking price and to conclude the sale as soon as possible. The owner of the property has been repeatedly calling Rebecca to inquire when the sale will be completed. Rebecca comes to you for advice. Based upon the facts, what should Rebecca be particularly cautious of and how should Rebecca proceed?