I hope you had an import permit for that, and it was declared and inspected by DAFF. Landing beans direct (sneaky) is no joke, could destroy the whole industry here with a pair of bugs on board. Mr Austin couldn't see a problem with letting a few rabbits out either. -- rant finished --
I've only played with Liberica once, a few years ago.
Landed 5kg from the Philippines (with permit, declaration and inspection) and yes, it roasts very much like a robusta but seemed tough getting anything nice from it regardless of the roast depth. Good looking beans, they roast well but taste nasty.
Hope you have better luck than me!