SIM tray - Warranty

Hey guys quick question, I went to the Apple store because my iPhone needed replacing. It was approved for the exchange under my warranty but because I had my friends sim card tray in my phone they would not allow the exchange. My sim card tray was loose, and my friends iphone broke so he gave me his. I just ordered a generic sim card tray from eforcity and i'm wondering if I am able to exchange my iPhone now? If I dont have the original sim card tray does that void my warranty? Thanks in advance