It may be a family matter, but you need to be professional about it and bring it up in a diplomatic manner before you leave. how diplomatic is up to you, but to highlight on a possible "error" you have found will give the MD the choice to investigate and make his own conclusions - you do not have to have an agenda to do this, you are merely doing your job.The last thing you want is some kind of retrospective blame pushed onto you should this emerge later.You are out of the place, so it doesnt matter, you will still have your self respect. I have been in this situation twice now and it was literally ? millions - both times I have been massively shit on, so you really shouldnt take my moral stance on anything. good luck