Reported on the RC Bugs forum and confirmed in my testing. When placing a CSEU cart or an MFE cart in a crafting grid, a Batbox is returned (along with the minecart) every time; never the CSEU or MFE. Tested in both Creative and Survival with Railcraft_1.7.10-9.3.3.6 and industrialcraft-2-2.2.653-experimental.