In 1973 I worked for a national newsagents supervising their Sub-Post Offices, we issued thousands of petrol coupons across the country, we had to see the car log book and date stamp it to prevent someone trying to get more than one issue of coupons. It created a lot of extra work at the counters, but the Post Office paid the company for each one issued, so the staff were happy, we paid them a bonus.
One office (not in Birmingham) was approached by a couple of gentlemen offering cash for any that may have gone missing, they were arrested later that day at another office, when they tried the same trick.
Colin