You are probably overthinking it.
If you followed the instructions when you were awarded the registration
you should now have the ON and overall length securely fixed/punched,drilled into the structure of the vessel and the name and port of registry marked on the vessel as they required. These identify the vessel according to an international shipping
AMSA may also have noted the engine
number on the certificate. The certificate also includes details of the ownership
of the vessel in 1/64 shares.
As far as the world at large is concerned the vessels identity and ownership
is now established per an international convention to which Australia
is a signatory.
You no longer have a boat as AMSA does not recognize anything called a "boat" they only recognize "ships" and ships don't have a HIN although they may have a builders hull
You probably also received a letter which informed you that the identities marked on the vessel have to be maintained properly and that it must not be identified in any other than the official manner. This is because the convention requires that a ship only have a single
As far as the Australian government
, and any other party to the convention, is concerned you have already adequately proven the ownership of the vessel as stated on the registration
certificate and consequently do not require any other documentation
. A bill of sale
should no longer be required unless you sell the vessel to someone else and they want to transfer the registration.