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The exact order of the last matches is therefore:
27/12/1947 Peru 2-0 Bolivia
27/12/1947 Chile 4-1 Colombia
28/12/1947 Argentina 3-1 Uruguay
30/12/1947 Chile 4-3 Bolivia
30/12/1947 Paraguay 4-0 Ecuador
I'm 100% sure, as I consulted almost all the South American dailies from that period. So the tournament ended on December 30, rather than on 31.
I didn't verify the dates of the previous matches though, so if you want to add or correct something you are welcome.