Yes I sent in the form with the impressions of my fingerprints and left the address of the place I'm living here in BsAs, but never heard anything back.
I don't think you'll ever hear from them if you didn't provide a US address.
When I was applying for temporary residency I was told the FBI does not send reports outside the US. I had all of my documents (including my criminal background check) sent to a friend in Chicago who got the Apostille for them. Then she sent them to me in Argentina via FedEx.
If and when you order a new report, remember to request the certification by the State Department and provide a US address for the form to be sent to . Also keep in mind that migraciones only accepts the reports that are certified and less than 90 days old (from the date of issue).
If you're going to apply for temporary residency based on a work contract, the FBI report should be the only document you'll need from the US. When I applied for the visa rentista, migraciones still required the birth certificate and I had to document my income. Those docs needed the Apostille.
You'll only need the FBI report that is certified by the State Dept. and you'll have to have it translated and the translation legalized in Argentina. In addition to the FBI report of course you'll need your passport (from the USA) but it won't need to be translated or have the Apostille.
It's not going to be easy to find a business that will offer you a work contract if you don't have a DNI. I am surprised that Wall Street English actually let you start without one. Dr. Rubilar says you have a good caase against them and the face a fine of $450,000 pesos, but in another post he mentioned a fine of $300,000 pesos for "working" without a DNI.
According to my English, the word "working" in that sentence would apply to the worker , not the employer, so I'd want to know for certain if the $300,000 pesos fine appliers to the worker in Argentina before I ran crying to AFIP (or ANSES as the case may be) to get a few months salary in "damages" for unlawful termination.