Just to let you know my experience, upon arrival decided that I would go for the covid test and fill in the declaración jurada for CABA. I had to pay $2500ARS but it wouldn’t take payment from any of my cards or the wife’s cards so I asked if I could pay cash, couldn’t. Then they said do you have travel insurance so they took the details of the policy and then let me go and get tested. Got tested immediately and in theory will have a result within 4 hours they said. Still have to do 7 days quarantine but the girl was of the opinion that if you had a negative test ya está.