One of the animals died at the time.
The case caused a scandal and raised a number of questions about the keeping and farming of exotic species.
Seven of the tigers were eventually taken in by a zoo in the western Polish city of Poznań.
Five of these have now been moved to an animal shelter in Spain.
Meanwhile, the Poznań zoo has been visited by lawmakers from a Polish parliamentary team for animal welfare to discuss potential changes in regulations.
Elżbieta Krajewska talked to the director of the Poznań zoo, Ewa Zgrabczyńska.