My parents in-law won ten grand on the monopoly thing yrs ago.
They would go to one Mickey D’s every few days for coffee and would get the monopoly pieces. They never thought much of them but kept them.
One day my father in-law checked the pile they had for something to do and found he had all the pieces for something ( dont remember what) and asked the guy behind the counter what it meant (they are portugese and their english is not great) and the guy said he couldnt touch it and told them to send it to the address listed for prizes.
They did and about 4 weeks later got a registered letter and a cheque for 10 grand. They had no idea what they had won till it arrived.