I concur with my colleagues that this is not valid, but an employer would not know this. Read the Denial of the I-485 carefully as it likely...

The approval notice clearly says this is not your official document. You will need to start over again.

As an Australian citizen you may be eligible for an E-3 which you can obtain at the consulate but up to you to find the sponsoring employer.

That should not be a problem for domestic travel.

The case may already be at the consulate in which case you need to contact them to reopen the case.

Yes, but this is not necessary -- can use the same account.

You may keep the I-485 pending and keep the ancillary benefits and file an I-360 VAWA petition. If you ignore any interview scheduled though the...

It depends on whether you are a U.S. citizen or a permanent resident. If USC, there are no derivatives allowed and you will need a separate I-130...

Advise you retain a reputable removal defense attorney immediately located in the area of his detention.

Yes immigration cases are transferred all over the country. Open and use. Congrats.