Let me extend our apology for the difficulty that not having contact_ids in a bulk export result causes in trying to sync it with contact records obtained from the Contact Collection and Resource endpoints.
I have brought this to the attention of our Product Owner. We will bring this request to the team owning the underlying bulk contact action service, and ask them to add this property to what they currently expose. A larger ask will be for them to provide all properties available via the Contact endpoints.
Feel free to contact me either in the forum or via PM for a status update.
Rich Marcucella Sr. Technical Writer, Content Developer Web Services Team http://developer.constantcontact.com