You could contact the Human Resources Department at any UPS building or try this info from the Thrift Plan's 2006 Form-5500 . . .
Name of plan: UPS THRIFT PLAN
Three-digit plan number (PN): 002
Plan sponsor's name and address (employer, if for a single-employer plan):
UNITED PARCEL SERVICE OF AMERICA, INC.
C/O TAX DEPARTMENT
55 GLENLAKE PKWY NE
ATLANTA, GA 30328-3474
Employer Identification Number (EIN): 95-1732075
Sponsor's telephone number: 404-828-7678
Signature of plan administrator or printed name of individual signing as plan administrator: JOHN SAUNDERS 10/09/2007
Signature of employer/plan sponsor/DFE or printed name of individual signing as employer, plan sponsor or DFE as applicable: MAURICE AGRESTA 10/09/2007