RedactedNarrative: Vessel operator reported he was entering into channel system from the Gulf of Mexico and struck a large dredging pipe. The impact caused the  lower unit to kick up subsequently cracking the top of the transom, and the top of the motor cover. Vessel operator failed to mark the area with GPS or document any other evidence and delayed reporting the incident until the following morning. It is believed that the operator did strike a fixed object in the area reported, however it could not be factually determined that it was a dredge pipe.  Subject issued written warning for failure to notify proper authority of a boating accident exceeding 2,000.00 in damage,and or injury.