I had a connection in Bogotá, in Colombia yes, they did count the money. In Argentina, they asked, I just said I was bringing less than 10 000.Did they count it in front of you? Was it on a money belt?
The point is, if you don't declare it, and they see the money and count it, it might be very hard for you to see this money again. If you declare it, you will have to provide the source of the funds.
I used a small man purse to bring it but as you know, everything goes to the scanner.
As I said before, I would never come to Argentina with an amount that I would have to declare.