Great photos, but I still can't really make out the Y shaped groove business on the muzzle. These do look to be a fair size, and the belly looks grey not whitish, so they are possibly gouldii (as per Menkhorst & Knight mammals field guide). Have to hope someone who knows their bats a bit better has a look at it.
OK, so do you want to confirm them as such then? The other option if you're not 100% confident is to just confirm them as Nyctophilus sp. I'm only a moderator for plants these days, so I can't do it. There's another record from the same place also needs looking at (check unidentified, mammals) to find it.
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