if you underestimated, the CCB will have already been done. you would have had a debt, which would have been taken out of the CCR payment you received (so hard without seeing for sure!)

ftb would have been reconciled too - if you haven't received a payment, chances are you may have a debt - jump on online services and go to "manage the money you owe" - it should show the debt (but only if it's been raised already)

so hard to say for sure - too many variables (it may still be a credit that was sent to ATO as outlined previously too kwim)