Jonathan, the search function available in the Screenshot Library has
some (hopefully) nice features, but is nowhere near the flexibility of
a search engine like google.com, where you type anything and it will
come up with reasonably good results.
In the case of the Screenshot Library, you need to provide
at least -some- hint of what you are looking for.
In your case, as a search by name is not available,
you need to insert the string pilot=1343 to retrieve all
your screenshots.
This said, please notice, beside the Search button, a question mark.
If you click on it, you'll find the documentation of the Search function,
and the other type of search that are currently available.
Hope it helps.
Ciao ciao!
Manu