Clearance delay is not something to be worried about just yet. No one knows the exact formula but certain aspects of shipments randomly subject them to extra scrutiny. On the flip side just because it is not branded does not mean it is not going to get seized. Certain patented goods are subject to intellectual property violations just like branded goods.
Only experience I have been seeing is that for the large part, custom delays with DHL result in seizure but rarely, they can clear with no problems. You will have to wait.