TIAA CREF

I received a mystery shopper inquiry followed by a cashier's check drawn on Dade County Federal Credit Union, Sweetwater, Fl. That location doesn't exist. I called the bank; a rep told me they received several calls a day about this.
The address on the mailing envelope is: Peter Johnson, TIAA CREF, 205 Ikena Circle, Honolulu, HI 96821.
The letter was signed by Chris Harding, HT Manager Task Coordinator (424) 293-1677, Processing JOb Unit, Secret SHopper, #65553