I am not sure if they have been there for a while. The cords look in good condition. Also if they had been there for as long at it looks those tags would be gone.
To my completely untrained eye it looks like the panel has obvioulsy been there for some time. Not the wood coloration. But then every once in a while someone comes along and puts in new extension cords. Either that or what is the deal with all the tags???
Someone coming along and inspecting the cords to make sure they are ok?
I don't know.