Mail zip code problem can someone help me?

Ok so i'm having a package sent to my aunt's house in Vandergrift PA from a different state....now i accidentlly put 15068 instead of 15690 Now 15068 is my towns zipcode which is about twenty minutes from Vandergrift do you think that my post office will notice the problem and send it to the right place or return it back to the state it came from? could someone tell me what to do because this package needs to be there before christmas.