what will happen if the petition receipt got lose

what will happen if the original copy of the petiton or receipt accidentaly got lose ,but there is a xerox copy of the receipt or petition left..... do we have to inform the INS as soon as possible about the original copy of the receipt being lose..... and ask for another original copy of the receipt ...... or the remaining xerex copy of the receipt will do.... who do we call or inform that our receipt got lose

Need help what to do......

what will happen if the original copy of the petiton or receipt accidentaly got lose ,but there is a xerox copy of the receipt or petition left..... do we have to inform the INS as soon as possible about the original copy of the receipt being lose..... and ask for another original copy of the receipt ...... or the remaining xerex copy of the receipt will do.... who do we call or inform that our receipt got lose

Need help what to do......