I entered Argentina on June 20, 2022. They told me it's 9999 USD per group, it doesn't matter if you are related or not. Starting 10 000, you have to declare it, I had 9 500 USD at that time but had others currencies. Fortunately, the total amount was just below 10 000. If you can't show the source of the funds, they will confiscate it. What follows, I don't know.