I have the Millenium sets for all the Harrah's in my collection - but no "strays, orphans or extra sets" and haven't for a while.
I think I traded the last of my "Legends" chips @ convention 2001.

BUT - they were released at the following Harrah's.
You might appeal to people in these areas:

TUNICA, MS
VICKSBURG, MS
MAYENTA KANSAS
SHREVEPORT, LA
MARYLAND HTS, MO
N KANSAS, MO

Sorry but good luck!!