You might have a FTTB connection. Can you check this in your account details?
Do you have a wifi router from TPG or the one from your previous place?
FTTB may not need a NBN connection box.
I thought FTTB because you are an apartment block.
I don't think your old router is going to work.
TPG ought to have sent a new router for your type of connection there.
Were you ADSL at the previous place?