That radiosonde I found last week — I have more info:
That balloon was released from Hobart Airport on the 27th December, 2018 … Andrew Winchester | A/Observing Network Support, National Observing Operations, Data and Digital Group

@yorrike It had a USB port that was all clogged up with weed or something. I tried to pry the thing open but it wasn't totally easy so I gave up and put it in the bin.