Find (and close) open paths in illustrator

Or maybe this script?

wr-closeallpaths.jsx

http://illustrator.hilfdirselbst.ch/dokuwiki/en/skripte/javascript/wr-closeallpaths

You mean: just find all open paths?

Or

Find those open paths that actually need to be closed (perhaps because they have a stroke applied)?

Astute Graphics FindReplace can find all open paths

And their PathScribe panel can then close them

RJ-Grafix Select menu also can find all open paths.

You would then need a script to close them.

In some cases you could perhaps just create a live paint group to close them (and then expand), but this will change the stacking order in your document which might be something you do not want.