Cash Management Lockbox System benefits. Increased working cash-reduces time required to convert receivables to cas h Elimination of clerical functions bank handles receiving, endorsing, totaling and depositing. Early knowledge of dishonored checks firm learns of customers bad checks fasterCash Management Lockbox System benefits: • Increased working cash - reduces time required to convert receivables to cash. • Elimination of clerical functions - bank handles receiving, endorsing, totaling and depositing. • Early knowledge of dishonored checks - firm learns of customers’ bad checks faster