They look like a plug or key of some sort, located right next/on the emergency exit. I even saw the stewards TRIPLE check each other if it was removed so it must be really important.
Thankful if someone explains!
In: 8
The disarm pin for the door emergency opening. Idk the particular plane, but in short, you have a massive inflatable slide and may have a device to force the door to open. For the second, you mistakenly activate the door opening and the door flies outward catapulting you holding the handle into a fall of several meters onto concrete. For the slide, it deploys outside or inside the plane causing damage and possible injuries.
These devices are locked deactivated on the ground. The crew is responsible to activate them and deactivate them at the right moment to keep everything in the safest condition.
What you reported is the cabin crew making sure the system is now activated so the plane is ready for the taxi and takeoff. They will disable the system just before opening the door after the stairs are in place at your arrival.
The procedure generally include double or triple check with multiple individuals.
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