You have to be one of the most persevering collectors in the world~
This is a very slim lead and literally might get you nowhere, but I have reason to believe that this seller sold the Drexler you are looking for back in 2007. You should try asking him to look through his archived sales, if they even go that far back, and find the guy who bought it. Good luck with the rest of your set man.
stevesauct - his Ebay ID.
TAKE A PEEK ~ I COLLECT STAR PATCHES AND AUTOS