RWY INCURSION BY ARPT VEHICLE ACR LANDED ON OCCUPIED RWY.

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I WAS INFORMED BY MY CHIEF PLT THAT HE RECEIVED A RPT BY MR. X STATING HE WAS COMPLETING A FIELD CHK OF FLINT BISHOP FIELD AND ANNOUNCED ON FREQ 126.3 HE WAS XING RWYS 9/27 TO TXWY H AT AM30L. AS HE EXITED THE RWY ON H; HE HEARD THE ROAR OF A JET AND OBSERVED IT BEARING DOWN ON HIM. HE ALSO SAID HE HEARD THE TWR TRYING 2 OR 3 TIMES TO CONTACT THE JET. THE TWR ASKED THE CREW TO CALL HIM WHEN THEY REACHED THE CARGO RAMP. MR. X WAS TOLD BY MR. Y TO CALL THE TWR. THE TWR THEN TOLD MR. X THAT THE PLT APOLOGIZED FOR WHAT HAD HAPPENED AND THAT WAS ABOUT ALL THE CONVERSATION MR. X HAD WITH THE TWR PERSONNEL. ALL I CAN SAY IS THAT I AM AT A LOSS IN REGARDS TO MR. X'S RPT. AT NO TIME DID I OR MY COPLT HEAR ANYONE XING RWY 9/27 ON THE RADIO. WHEN WE LANDED WE SAW NO VEHICLE ON THE RWY OR EXITING THE RWY AT TXWY H. WE HAD NO CONTACT WITH THE TWR BECAUSE THE TWR WAS CLOSED AT THE TIME OF OUR ARR; NOR DID I APOLOGIZE TO THE TWR FOR ANYTHING. THE ONLY CONTACT WE HAD WITH THE TWR WAS WHEN WE TAXIED OUT FOR DEP AND TO RECEIVE A CLRNC TO GRAND RAPIDS ARPT. I MUST SAY THAT I QUESTION THE RPT SUBMITTED AND RECALL NOTHING MR. X STATED. I AND MY CREW CONDUCTED OP WITHIN THE GUIDELINES OF ATC AND FAR RULES. WE ALSO RPTED XING THE FINAL APCH FIX ON 126.3. NO TWR CONTACT WAS MADE UNTIL TAXI FOR DEP AND NO VEHICLE WAS SEEN ON OR EXITING THE RWY UPON OUR ARR.