>Pictures of then-Iranian president Mahmoud Ahmadinejad’s visit to the Natanz facility helped the experts obtain needed intelligence on the computers. The computers, their configuration and their rear connections can be seen clearly in the pictures. Eventually, these entry and exit points served as portals to implant the virus.

I doubt that this alone was all they needed. Probably once they had identified the vendors of the equipment, they retrieved the purchase orders from those vendors, either with or without the knowledge of said vendors.