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I'd put it down to someone setting off fire lighter balloons. Fire lighters, the square type you get in the supermarket , you can get them easily and put them with a plastic bag of sorts and you have your own hot air balloon. Let them go and watch them drift away with the wind. Depending on wind conditions at the time they can last ages, or not long at all... Seen quite a few from here... Very dangerous as they can cause fires.
There was a Southerly wind in Melbourne at around 7pm local time, wind was roughly about 20km/h gusting to 28km/h also... It was also cloudy so the disappearance of the objects could be they ran out of puff, or they went into the clouds...
Anyway just another explanation of what it could be.
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