Ok I found this glitch from someone in a random match a few days ago. Only difference is we got up on the left side of the crate opening not the right side. A few other cool things about this glitch are:
-you can pick up drops (max ammos, nukes, insta kills, etc) from the roof of the first crate just by walking on top of them.
-you can kill George and get extra perks and the waffle same way as above.
-large range of movement.
-four players can easily get into it.
-ability to see what drops you get before you pick them up.
-you can survive extremely long in this spot with a team of two with the right weps.

This is definitely my favorite glitch on COTD and me and my friend just set our record today!

Wave 50 - 4444 kills - 600k+ pts