If you have access to the database you can run this query to find the space name and page title of each instance of this macro. To find the search string to you'll need to know the macro title, which you've said is SEO. So run a query like this against the database:
-- SEARCH BODYCONTENT FOR REFERENCE TO A SPECIFIC STRING
select s.spacename, c.title
from bodycontent bc join content c on bc.contentid=c.contentid
join spaces s on s.spaceid=c.spaceid
where bc.body like '%<ac:macro ac:name="SEO"%';
This will show you where this macro is used. If you're not getting results using Confluence search for SEO, you might also try this:
* Navigate to Confluence Admin > Cache Statistics
** Click flush all
* Navigate to Confluence Admin > Content Indexing
** Rebuild the index
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