This cache has nothing to do with the Church Micro series in the UK. Given that the Australian 2016 census indicates that No Religion and Jedi Knight are the fastest increasing classifications of the optional religion question "What is the person's religion?" it is not surprising that there is surfeit of empty churches that have been repurposed.
A micro church where there used to be a real church? The model church is perhaps celebrating the nearby village of Maggae, which does not seem to have a church. Ex or otherwise. No other details known.