Sending or receiving packages from Argentina can be a pain at times. One of the best ways to receive a package complete with everything the sender intended for you to receive is to have it sent by FedEx or DHL. We've had instances where packages were not complete or just not received when sent by regular Correo. However, anytime something was sent by FedEx or DHL it got to us just fine. Plus realize if you're mailing a package to Argentina, particularly Buenos Aires, that the person will need to downtown and pick it up in person even if they live outside of the city and it can be a long undertaking to do it and there is a time window they must pick up the package within to avoid having it returned to sender.
For shipping outside of the country, this is useful information from a post from someone in the Buenos Aires Yahoo group who was mailing a package outside of the country through Argentine Correo.
"I just came back from the post office after trying to mail a package
to the US. I used a shoe box and then wrapped a paper bag (inside
out) around it. It turns out that you cannot have tape on the outside
of your pack, ages, you can only use glue!!! I was very surprised. I
would think glue is not very secure. The package also needs to be
less than 2kg. (And mine was unfortunately 2.180kg.) The post office
sent me to a papeleria to get another box and they then told me to
come back after 2pm. The post office does have their own boxes, but
they only had very large boxes. Just thought I'd pass this message
along to anyone else trying to send Christmas packets back home
through the Argentine post.
PS. My wait was only 35 minutes at the post office, but I'd still
recommend bringing a good book because it can be much longer."