To recap, there's a 10,000 ARS per month threshold for cash pickup in Argentina using More MT - under that threshold, I believe you won't need any additional documentation, you can pick your cash up directly from the Libertad location using your passport and the tracking number given by
xoom.com. However, if you send an amount over that threshold, you'll need to provide additional documentation. It's a crapshoot whether xoom.com will inform you of this; you may need to call customer service and their compliance department yourself to inform them that you need to send them:
A scan of the first page of your passport
A scan of the declaration of origin & destination of funds, which they get from More MT Argentina
There is a possibility you will also have to scan or provide w/ pickup a copy of a recent bank statement. I needed this for my third transfer. Technically, I believe they're supposed to ask for your CUIT/CDI as well, but that hasn't happened yet for me. I've sent 3 transfers so far.
If someone has trouble getting a copy of the declaration of funds form from xoom.com, PM me and I'll send it to you. I don't know how to post it as an attachment to this thread.
Also: the xoom coupon "speedmay" was working, as of last week, for free transfers, including from a credit/debit card.
Dealing with xoom customer service is truly awful; no one seems to have any idea what's going on over there. In comparison, the more MT side was nice and smooth, although I agree that their location on Libertad seems slightly insecure due to the giant glass facade.