In 2017, it seems unreasonable to say one should have to resort to sending paid postage (from Australia) to simply get in contact with a company who has stolen their work.
[1] https://www.wikihow.com/Send-Certified-Mail-(USA)
[2] http://www.kalzumeus.com/2017/09/09/identity-theft-credit-re...
Control-F "Do you like paper trails? I like paper trails. I particularly like paper trails where the United States Federal Government attests to the exact minute your firm learned the contents of this letter." (hat tip to patio11)