A very warm welcome to MASA Knuppel! You have a battle on your hands, mate. The problem I have found with Copperband Butterflies, is that they are firstly reasonably scarce (in LFS's), and secondly, when you do indeed get one from a LFS, you are NEVER guaranteed to know if the fish will ever eat. If you get one that eats, you are darned lucky that it does. IF it does not eat within 1 week of getting them, they usually end up dying in our tanks. :-(
Then, you have a possible chance of getting them from a fellow reefer - which, IF there copperband feeds, won't be easily convinced to let go of their CBB.
So - please be patient - you might get one, I dunno about two, but, it might take more patience than none.... :-(
Why, if I may ask, do you so urgently require TWO Copperband Butterflies? Is it perhaps because aptaisia is driving you nuts and killing off/irrititating you corals?