That doesnt negate anything I said, and I stand by it. You cant ignore the fact Bankwest has to comply with the law/regulation how they are dealing with this.
Your experience with ANZ just means they finalised their investigation before you got the statement. When it happened to me with NAB they did the same thing, they wiped all the transactions virtually while i was on the phone. I asked why they are not checking with me what transactions are valid, and he said "no need, i can tell". He did tell me that the transactions were done with a forged credit card
For whatever reason Bankwest is going through their process. You may not have spoken to a decision maker, or its not immediately evident the transactions are unauthorised. You have nothing to worry about until you get your next statement, at least.