ForAllValues:BinaryEqualsIfExists
compares a list of binary values in a request to a list of base64-encoded string representations in your policy. There are no known binary context keys, but this is put here for completeness.
To match a request, the context key can be absent, but if it is present, all of the binary values in the request must match at least one of the base64-encoded string representations in your policy.
You can NOT use policy variables in the value of this operator.

