There are Delta people in this forum (mostly unofficially) They probably just don't have an answer for you.

I don't know the answer to your question. I've never heard of a limit as far as packing it in checked baggage but that doesn't mean ther isn't one or that there isn't some special consideration for EZE. I haven't been able to locate an answer for you on the company website.

Is it possible that you are not allowed to check more than what the US allows you to bring though customs?