Unknown component and tank flap does not lock

Hello, I’ve had a 850 in my possession for a few days now. I’ve also slowly familiarized myself with the Mackerel. I changed the wiper arm driver side today (the old had limp feathers and was a bit bent). Since he unfortunately has rust on the fender driver side, I went today to the ground and tried to touch how bad it is behind the bumper. In doing so, I found a kind of can of rear fenders, on which several hoses, I believe vacuum hoses, But this is only kept by a cable tie! Can someone tell me what this is? And does someone often have an image of what it should look like? I also noticed that the tank flap is not locked when I lock the car, is there the engine often defective? Greeting and nice evening Christian