Not All Maps Display in Sven Coop

I downloaded several map packs for Sven Coop. When I go to the map selection screen most of the maps are not there. I thought that there may be too many maps to place them all in the map selection menu screen. So I tried removing many maps from the maps directory in Sven Coop. The maps are removed from the map selection list in the game but I thought that it would then replace the subtracted maps with other maps that didn't show up before. ---It does not---

Can anyone think of a way that I can be able to use these other maps?

Thanks