The Retirement Systems has made revisions to the bid document. Reference Package 4. Questions and Answers, Package 3. The Retirement Systems has made revisions to the bid document. Reference Package 2. The Retirement System is soliciting bids for a Blanket Agreement for Mailing Services to include but not be limited to folding, inserting, addressing, preparing, delivering and handling undeliverable mail for various system annual, specialty and other miscellaneous mailings.