On my way to work today I notice a scraping sound coming from under my Prius at low speeds. When I looked under the car I noticed the plastic cover that must be dropped to change the oil fliter was dragging the ground. The plastic clips that hold it in place were missing. I used a couple of zip ties to hold it up until I can get it to the dealer. I called the dealer service department to explain this and was told that I must have hit something that caused the clips to pop out and that this is not covered under warranty. The thing is, I did not hit anything, there is no damage, only the clips are missing. I had my second (10,000 mile) oil change done at the dealer yesterday morning. I explained this and asked if perhaps the clips were not re-installed properly and was told no. I don't understand how the assumption is made, with out having seen the car, that this could only happen if I hit something. Has anyone had this happen? Should I stand my ground or eat it and pay for replacement clips (what ever that costs)?