Ok sorry... I was invited to add myself to this thread but I was explained only later which my registration # actually was and where to find it ! Luckily I could still find my registering mail in the .recycled dir (yeah, I trashed those mails once the transaction was completed)

So, my Peg registration number of some months ago I can't tell, cos too much time has passed,
while my Mac registration number of some days ago is 3561