Nick Milas wrote:

Is there a way to formulate a query filter to say: "Find all entries which include two or more values (or exactly n values) in attribute xYZ"

In general: no

If you know the limited set of possible values there might be the possibility to query simply all 2-subst combinations. But the filter string will grow very quickly with the count of possible values.

or we must create a script to test?

Likely, yes.

Ciao, Michael.