Welcome to the Community!
We would recommend to use the NBN supplied equipment to ensure the service are running at it's maximum performance.
Furthermore, each of these ARIS box is provided with a specific Serial Number and MAC number and is configured at the network for each address.
Nonetheless, we'd like to assist you further regarding the missing NTD.
I searched for your customer ID via your Community and was unable to verify your details. Are you able to PM us your customer ID so that I may look through your records to better understand the situation?
For your reference, please see How do I private message (PM) in the community.