Hi Robert - nectar flow is long over in your parts. Propolis is what bees use to seal up drafts and places where pests come in, and isn’t really a good thing for your Flow frames but a sign that your bees are trying to deal with unwanted space. Michael is right, remove the box completely and set your sights on what can be done to help your colony survive the winter.
Please have a look at the search feature & you’ll find loads of info from numerous other posts about when is the right time to put supers of any kind on, how to encourage bees to fill the Flow frames, and of course your more immediate concern of overwintering.
Are you connected to any local beekeepers? Even if nobody near you is using a Flow system, they would have valuable local information about all the seasonal factors you’ll need to learn about & consider in order to keep your bees healthy. Good luck & let us know how you make out!