Wow,
I have to say that from what is posted here I have to agree with everyone that a deal was made and it became a contract when money changed hands. (Right Jamo)
If the original deal stipulated 30 days, then on the very first second of the thirty first day the contract goes into default, and the seller keeps the deposit. PERIOD.
All I know is I sure as hell will not buy a watch from some clown in Aussiland.
NOTE:
Of course all our regular Aussies know I am not talking about you guys.