Might be able to get some tracking info from diverted amnestics (think propofol, versed etc) which are commonly used in OR's.
Remember Epstein's dentist's chair on the island?
You can bet victims were put in it and told they wers just getting a checkup, when instead they were drugged
http://www.dailymail.co.uk/news/article-3688656/A-fully-equipped-dentist-s-chair-close-photos-young-girls-backsides-eerie-images-videotaped-walk-billionaire-pedophile-Jeffrey-Epstein-s-Florida-mansion.html
Look through his black book for dentists or anesthesiologists
http://gawker.com/here-is-pedophile-billionaire-jeffrey-epsteins-little-b-1681383992
https://www.documentcloud.org/documents/1508273-jeffrey-epsteins-little-black-book-redacted.html
Mfg of those drugs know where they go, at least in the US. Overseas, who knows?