The shipment came through DHL, so DHL contacted me to give me instructions when the package was about to arrive in Argentina. I had to do it before the package could be released for pick-up -- I didn't have it shipped to my house, just to the DHL office, but that was just a personal preference. I had to go to an AFIP office and provide a copy of my passport and precaria (presumably it would be your DNI instead if you have one) and another form, and they generated an online account for me. It would have taken about five minutes if I hadn't accidentally brought an outdated precaria copy. Then I had to go home and associate some contact information in the online account and send a specific screenshot of the account to DHL. Apologies for not remembering the details of which part of the account needed the screenshot or the name of the AFIP form, but they'll also send you all that information if you get something through them. DHL did have a quick turn-around requirement, though -- I had to get the screenshot to them in 48 hours, but since I was able to waltz into the AFIP office without an appointment, it wasn't hard to do.