वैदेहकव्यञ्जनो वा सार्थप्रमाणं राज्ञः प्रेषयेत् ॥ कZ_०२.२१.२७ ॥
vaidehakavyañjano vā sārthapramāṇaṃ rājñaḥ preṣayet
Or, a messenger/agent from the foreigner may send the caravan’s particulars (certificate/return) to the king.
It creates parallel channels of information to detect collusion or manipulation by intermediate officials and strengthens central oversight.