Hi, have you checked all coax connections from your router to your omnibox on the site of the premises are present and that there are no cuts, also fully connected and finger tight. Green often means no connection somewhere that's why i ask. I think you might have a cable that's not connected somewhere between your router and the cabinet, tempted to say the cab as it often happens.
from my point of view if the box is inside there should be a cable connected through the wall outside unless its a new build or custom install. There should also be a yellow or green duct with one of the two omniboxes, if not i think the previous owner has ripped out all the cabling and you might need a two man crew for a repull, a tech to rerun wires to the internal boxes and then check it all after. It took me about a month to get a two man crew when my coax was at end of life. Chances are you will need a technician