During writing the last clues, a winner has been found ! Congrat. Tim May ! It was Wassenaar Zoo which kept 2 specimens of the Luzon Clouded rats during the second half of the 1970-ties. They were kept in one of the monkey-cages in the Crocodile-house and both died on Pseudo-TBC. One of them was called Captain Hood and because of the rarety of the species even the Natural History Museum at Leiden showed intrest in the specimens ( don't know however if the dead animals were given to the museum.. ).
On Zootierliste these animals are not mentioned.