Did a quick search on this guy and found this on the Pamperedpeeps website:
The importation of Yellow Sided Green Cheeks occurred in the early 1980’s at a quarantine station in CA and ended up with Steve Garvin and Deanna Ferris.
In the book I was reading, the quarantine station in CA is where the smuggled birds went after the smugglers were caught. Then they got put up for auction instead of being released back into the wild where they belonged.
After reading this book, my mind has been forever changed about having parrots as pets. My birds aren't going anywhere, but I will never buy another one unless it is in desperate need ie Bean.