Hi,
First reports of monitors in captivity? Or just in USA? First report of captive Varanus comes from Egyptians with desert monitor, Varanus griseus ~1500 B.C. whereby the Pharoahs reported "The land Crocodile" (= V. griseus) making little reproductions of themselves. In 1861 V. albigularis (= Regenia albogularis) was first kept by the British Museum Natural History, London.
I know that Louis Porras was apart of an early reptile trade place called, "The Shack" in Florida. I "think" Louis is still in CO, but not sure? Maybe he is doing eco-tours in Florida?? Try contacting Tom cruchfield who may know more....he has been around, in and out of jail for smuggling animals and knows alot of this type of thing; Raymond Hoser wrote two books titled, "Smuggled" and "Smuggled-2" about animal trade.... the real culprit of animals and conservation is not the pet trade by much consequence (although it can always be improved on), but habitat loss/fragmentation, hence loss of genetic diversity among the populations, and the skin-trade markets, especially for V. salvator and pythons in S.E. Asia...
good luck,
markb