Posted on the Department of Labor's website: "Effective March 29, 2011, the address for the Delinquent Filer Voluntary Correction Program (DFVCP) lockbox will change to: DFVC DOL, PO Box 71361, Philadelphia, PA 19176-1361. There is no overnight delivery address. Note that submissions to the DFVCP also can be done electronically. To do so, follow the
DFVCP penalty calculator instructions for online payment."