As an example, you had:
Which 301 redirects to:
Which is 404.
At some point, it was deemed that:
Was the more complete of the two and 31261 was merged into it.
Can we not have merged IDs redirect to the ID that they got merged into?
The API returns 404, Status Code: 34 and "The resource you requested could not be found.", but no IDs related to it.