Hello, usually the USB dongle is taped to the cardboard on the box that holds it in place inside the box. If you are not able to located it, we can replace it under the warranty. Simple just visit the support page for this item and file a claim. -Danielle from Logitech
Since the K360 does not have Bluetooth, this will not work an iPad. The K380, K480, and K780 models will all work with your iPad Pro. If you want the 10-key panel on the side, the K780 is the way to go.
Unfortunately, no. The K360 wireless keyboard requires connection via the included USB unifying receiver and will only work with devices that have a full-size USB port.