Small found red or blue OPA (Office of Price Administration) coins?
They were used as change for retailers to give back for food bought with ration stamps. They're made of vulcanized fiber (celluloid) and were commonly called OPAs.
The blue OPAs were change for processed foods and could only be used to buy processed foods; red OPAs were for meats and fats.
They came in different denominations (red "MM" OPAs were $5, the highest red OPA, and blue "WC" OPAs were $10, the highest blue OPA).
I have several sets of cufflinks made from OPAs in different denominations. People ask about them and they're a nice 'educational' item. They're quite inexpensive, the blues much easier to find than the red OPAs. I know places where you can get a full set of all 24 blue OPAs - including the rarer ones - for around $34-36. The common ones are under a buck apiece. A cheap price for a teaching tool for kids and grandkids. "Wait? That tiny, thin, round piece of plastic was money, and the only money you could use to buy food because the government said so one day? Cash wasn't any good? You mean the government can do that?"
The government is running a bigtime inflation / deflation racket against the people. Blame Congress, it is responsible to "coin money and regulate the value thereof."
That’s pretty good.
Mine were red.