OK so someone keeps leaving stuff at my doorstep, like they ring my door bell and run away???

Its happened twice in the past week. Both times my parents have been home, but I haven't been. The first time the person(s) left a two pound dumbell ( im into lfitng), a new pair of goggles ( im into swimming), and a power bar ( im into running). Then, two nights later, they left a whole BOX of stuff, with my name on it. There was a workout dvd, a 3 pound dumbell, a waistpack, a 10 min tone ups for dummies book, a pedometer,. an elastic band, etc. I called a bunch of my friends and they all claim they didnt know anything about it.. AHH THIS IS DRIVING ME CRAZYY1 Why are they giving me all this stuff??????????