UPS does weird things with their ground orders. I went to Purdue (West Lafayette, IN). Many packages would ship from Louisville, and for UPS those would go through Indianapolis (about 90 minute drive from West Lafayette). If I shipped UPS ground, my packages would consistently sit in Indianapolis for 2-3 days. While it's possible that their truck was just always full, it was so consistent it felt to me like they were intentionally delaying it.