Which loyality program should I use for my Aerolineas Argentinas flights?

In December 2013 and January 2014 I did a couple of flights with Aerolineas Argentinas. Since some of them would let me earn a lot of miles, I'd like to join a loyalty program where I'll get miles for the flights.
Aerolineas Argentinas is member of Skyteam. Each of the member airline has its own loyalty program. Currently, out of these loyalty programs, I'm only member of Flying Blue. However, Flying Blue requires the original boarding documents which I don't have anymore. I tried to join Aerolineas Plus to get my miles there, but they require that you already have been a member at the time of the flights.
So my question is: Which loyalty program can/should I choose so that I still can get miles for these flights?
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What frequent flyer program is Aerolineas Argentinas?
Aerol\xedneas Argentinas joined SkyTeam in August 2012, becoming the first South American member of the alliance. SkyTeam is a global airline alliance, founded in 2000.How do I get in touch with Aerolineas Argentinas?
If your enquiry is regarding flight changes or if your purchase was done through another point of sales, you may contact our local call center 1-800-333-0276 or our local ticket offices.AEROLÍNEAS ARGENTINAS 737 Business Class【4K Trip Report】Flying to RIO!
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