As this private collection will be distinctly illegal, I would not hold your breath hoping Batto will break confidence by openly saying whereabouts it is, and who holds these animals.
@DavidBrown It seems that other than Japanese Macaques there are very few macaques to be found at any AZA-accredited zoos. A few Lion-tailed Macaques might be around, plus a few Crab-eating Macaques and that is about it.
Contrast that information with a small, privately-run facility known as Special Memories Zoo in rural Wisconsin. There are 5 macaque species (Rhesus, Sulawesi Crested, Booted, Crab-eating and Japanese) at that single zoo! It never ceases to boggle my mind as to what animals can be found at the non-AZA establishments.