See also #473.
Obviously the Iranians would not just leave the missiles at the airport and fly back to Iran.
Hezbollah would need 'advisors' for the installation and training.
I only question the statements that Iranian Guard troops fired these missles. It is unlikely that they require much in terms of setup and apparatus to fire or the Israelis could spot them and eliminate the personnel and equipment. I would imagine they are using weapons which can be quickly fired without having to lug around launchers.