Mr Wardezki said his frustration wasn't at the value of items stolen, but the memories they were attached to.
"Now all we have is the clothes we were wearing, our wallets, and I have my cellphone with about 500 pictures. Sandra's iPhone was in the car.
"[Sandra] is even more frustrated. She has been keeping diaries since 2010; they're very important to her."
A St Heliers Bay family Mr Wardezki's sister worked for as an au pair is looking after them.
"The security guard at Sylvia Park said footage showed a car drove into the carpark, stopped next to our car, smashed the window, took the backpacks and then drove off. Police said it wasn't that likely the items would be recovered."