Some new boards show up on the web, but not in the API

@jaacquees You could look that up within our documentation, or on the API Playground directly simply by looking for the relevant query. For example:

That would lead you to see more information about this query, for example:

In items_by_column_values, as far as I know, it is not possible to query columns that can have more than 1 value at a time, for example, if multiple people are assigned. You can find more information on the subject in this community thread as well:

-Alex