It seems pretty clear that the box should be checked and the exchange rate disclosed. But I could be missing something.
A lot of times professional skip corners. They might think as long as the USD amount is correct no one will care. I would prefer to do it right. Usually no one will care because no one will look at anything on any particular form. But if it is reviewed you want it right. Especially for something so easy to do.
Check out the 8938 instructions as well.
https://www.irs.gov/forms-pubs/about-form-8938
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