TFM: A lockbox is a collection and processing service provided by a financial agent that accelerates the flow of funds to the Treasury's General Account (TGA) and processes associated data. This service includes collecting the agency's mail from a specified post office box; opening envelopes, extracting, sorting, and batching the envelope contents; scanning and capturing required data from payment instruments and remittance documents; balancing and totaling batches; recording the payments; processing the items; making the deposit; and providing collected information to agencies.

Green Book: A lockbox is a collection and processing service provided by a financial agent that accelerates the flow of funds to Treasury's General Account, and processes associated data. This service includes collecting the agency's mail from a specified post office box; opening envelopes, extracting, sorting, and batching the envelope contents; scanning and capturing required data from payment instruments and remittance documents; balancing and totaling batches; recording the payments; processing the items; making the deposit; and transferring the funds. Agencies receive remittance data either in hard copy or via electronic format.