ExtractCustomFieldValues to populate select box


I’m trying to use the ExtractCustomFieldValues plugin to auto-populate a
select box. It’s working find for fields where you enter text, but not
select boxes. I assume this is because I need to pass it an id number
(stored in the database) rather than a text string value.

Has anyone figured out how to get this working with select boxes?

I’m kind of guessing there’s some function I need to pass my string value
to to return the database ID number to update the field. But that’s purely
speculative on my part.