Bank account changes with no notification

I have a client that has at least 5 suppliers bank details changed with no email notification from MYOB

one of these clients was paid approx. $43,000 to a bank account that is not theirs

We have narrowed down when the changes took place 

I have searched the owners emails and found legitimate changes and additions but none for the 5 suppliers in question

Has MYOB got a log of the emails sent for these bank account changes as we feel there is foul play involved

The clients Bank has enlisted the banks fraud squad and my client has started a case with the police

Any help would appreciated ASAP