Essentially I have little piggy bank that would have around 200-300 coins or so (wild guess at this point) and I currently bank with a mobile only bank which does not have any branches.
I want to deposit the coins to get rid of them but am not sure the best way to do it. I know I can go to Aus Post and deposit the coins, but I don't want workers there having to individually count ~10kg worth of 10c coins!
Any ideas on how I can get this deposited?
Check with your bank.
You can deposit coins at Australia Post but the limit is subject to the Post Office plus your bank.
Most likely they want it in money bags too.