gst bill on vehicle

is it necessary to give tax invoice in vehicle if the goods value is less than ₹50000..and the distance is less than 10km....have already given tax invoice to the consumer....but in vehicle is it required to give bill??

also local state police is checking the vehicle within 10km from firm..and they said since bill is not in the vehicle...he will take vehicle to police station...and also ask for bribe....please help in providing valid govt information to avoid this..