So far, I've only (hopefully) identified some of the scripting that goes along with the spawning.
NVDLC03EncSCRIPT
NVDLC03EncListSCRIPT
NVDLC03EncCodeHolderSCRIPT
NVDLC03EncCodeHolder02SCRIPT
So far, it seems that these spawns only drop right after you've confronted Mobius.