To correct an I-94, Arrival-Departure Document (obtained at the port of entry during admission), file Form I-102, Application for Replacement/Initial Nonimmigrant Arrival-Departure Document. If the I-94 error was the fault of the border inspector or USCIS, you do not have to pay the fee. If the error was your fault, you do need to pay the fee.
Original documents submitted when not required will remain a part of the record. If you decided at a later time that you want your original documents back, please file Form G-884, Request for Return of Original Documents, with the office where you submitted the original documents.