I would say that he wouldn't get paid for the 2weeks they shut down as this would come out of your holidays but he wouldn't have accurred any.
He would have got paid for the public holiday (3 days)
BUT...... most companys would have paid him 2 wks holidays in lieu.
you can call Wageline and get clarification.
Also at Newsagents you can get the tax table form or on the ATO website to work out the tax on 3weeks wages and see if the $700 is tax ??? if its over you will get it back at end of financial year.
They must supply you with your pay slip - send them an email asking for a copy within 7 days please - just say you need for centerlink or something like that or the bank.
I understand that you dont want to rock the boat as its all new - so wage line may be able to make it clearer for you.
hope this helps a bit