The bag which contains currency notes is filled with Currency Notes bearing Serial Number 00000000. Every Bundle is with the same serial number.
When the young Vedha offers to smuggle drugs past the check-post for Cheta, he crashes the car which has the drugs into a road roller, damaging it and using a tow truck to pull the car out and bypass the check-point. The mistake is, shouldn't the tow truck be assisted with a traffic policeman to bypass any check-point?