Cluster Boxes

CBU Mail Delivery Systems The SEI Group (formerly Eric’s Locks) has been the preferred contractor for CBU and Vertical mailbox installation for the USPS since 2002.  We furnish and install AUTH- FLORENCE products (certified by USPS) per USPS specs, along with professional assistance in the configuration and location of your system as needed. As an authorized dealer, from the time of your order to installation is approximately two weeks.

With the USPS designating CBU type delivery for all new Single Family Residential subdivisions going forward, our background and knowledge makes us the most experienced contractor/supplier in the metro Atlanta region.


Allow the SEI Group to help make this change a seamless transition for your company.


Contact Roger Perkins