With globaledit's lightbox filter, you can easily search through your long list of lightboxes to find the one you're looking for.
To do so, click the filter icon in the lightboxes panel.
Begin typing the name of your lightbox.
As you type in the search field all Lightboxes matching your text will be brought to the top.
Results will also include grouped lightboxes.
You can collapse the filter by clicking the "X" in the search field or click your machine's "Escape" button. This will bring you back to the regular lightbox panel.