Yes, my parents applied for their visa in May 2015.
We have now managed to confirm that Centrelink do send an acceptence letter, but it takes 4 -6 weeks to be sent out after the Bank Guarantee (Bond) is lodged.
Centerlink need to train thier staff properly (on the AoS line) as the person we talked to stated that 'there was no such thing', and even checked with a supervisor !