moving a site from staging to product

My site is hosted on wordpress.com
I built the site in the staging environment. When finished, click the button to copy my staging to the production with my custom domain name.

It all went well. I run the Better Search & Replace plugin to update the urls from the staging to the production. This also went well for the most part except some elements.

I noticed the buttons that have linked to pdf documents are still pointing to the staging site and sliders with the background images are also still pointing to the staging site.

I have access to the database, searching the wp_posts and wp_postmeta tables for anything with the staging domain name and I cannot find any.

Where are those urls for the old staging name stored?

Thank you