Urgent - How to find "holes" in curves (to close them)

 From:  Samuel Zeller
Hello everyone, im doing a 2d work in MoI (typographic poster) right now and I have done a lot of cut (booleans) between text and 2d shapes.
Everything is closed curves at first sight but Ive found some non-closed curves, and after a lot of mouse zooming and searching ive found some little holes and fixed them. But now I got 5-6 non-closed curves where I cant find the holes maybe because they are too tiny.
Is there a script that use a selected curve and force close it, or find "less than X units curves" ?

Im on a deadline for this week so I need to find those damn holes ! I need to do "planar" on them and some extrudes with cap.