One of the ISCT6 enclosure handle could not be locked and it was guarded with an yellow caution tape.

Corey brought a new handle, but when we assessed the situation it turns out that the new one and the old one were identical, it was just that the old one was installed at a wrong angle. We removed the old one and re-installed after rotating 90 degrees, and voila, it can be locked when the door is closed and the handle becomes horizontal. Only  caveat is that the handle tip points up, not down, when the door is open.

We locked the doors and removed the yellow caution tape.