“could this have been entrapment by a social justice warrior?”
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Not likely, she was with a group apparently. In the fakes they usually work alone so they can’t be traced as easily.
Also, if you did catch somebody with this, they should have known better. It would be like demanding a bus driver to tell all the black people to give up their bus seats to white people and move to the back of the bus. If the driver does it, he would be a moron.
I can see that but without interviewing the customer you can't determine their motive.
This is essentially a 'hit-and-run'. The customer who committed the 'hit-and-run' fled the scene without being interviewed.
A proper investigation would include questioning all involved.