In Peru there is a huge catalogue of products to “buy” with Kms. But delivery in Peru only, you are in the states, right? No similar catalogue exists on the USA site. Maybe buy it and get delivery to someone in Peru who could then forward to you?
Transferring them to someone gracious enough to accept them
is questionable because it costs $7 per 1000 to do so. Given LAN should soon be offering their 1/2 price km sale (1 cent per km instead of 2 cents) the arithmetic doesn't work too well... but there is a small margin...
Best would be to fly LAN and get a 3 year expiry extension. I am trying to recall if a LAN code share would count to extend them? i.e. MIA-NYC. You could call them.