Project 04 - boxes that hold the gels?

This is probably a silly question...

what are the boxes that the photo gels insert into? I don't seem to have any in my kit.

They're from the wood cutout you should now have your UNO and breadboard attached to. You'll notice a little 'E' on them.

Thanks for the response! I kind of figured it was supposed to be those, but turned one direction it would just slide right down the sensor and turned the other direction I couldn't get the sensor to fit at all.

No worries though, I just made a little paper tray to hold them.

Now I just wish the green part of that LED light worked (sounds like a lot of people have a non-working green part).