Hi Brad, the newer versions of MinecraftEdu do not come with worldedit built it, but a newer version of worldedit is available to download from the online mods area which does enable the copying of chest information.
Unfortunately due to the way that MinecraftEdu manages signs, it is actually stored externally to Minecraft, not 'in' the block data so there is no easy way to bulk copy signs. There is the option of copying one sign at a time, and I find that quite useful, copy once, paste to all the relevant signs and then repeat. Although depending on how you are going about what you are doing this may not be an easy fix for you.
If you really, and I mean really, want to copy, you might find it easier to note down the coordinates of each sign and what should be on it, and manually copy the data into the signlocations_en.ini with the correct coordinates, this would not be super easy, but may make it a bit quicker if you can get the information down pat.
Elfie.