this isn't just coir alone, but no dung is added, just some insight on "growing with coir"
and i haven't found a single cubensis in hawaii on dung, they are easily found along coconut tree beds, only thing i have found in hawaii is copelandias on dung. Psilocybe's prefer dung, but as anything, they adapt.
Most psilocybes don't prefer dung.
Many of the bluing species found in temperate regions, such as Psilocybe cyanescens, seem to have an affinity for landscaped areas mulched with woodchips and are actually rather rare in natural settings removed from human habitation. Contrary to popular belief, only a minority of Psilocybe species, such as P. coprophila and P. cubensis, grow directly on feces. Many other species are found in habitats such as mossy, grassy, or forest humus soils.