"Maintenance was a headache; many of the Corsairs leaked oil badly. Finding enough of them was another problem. On June 23, the squadron only had 3 on hand. But more arrived in early July, and pace of familiarization picked up."
Can only think that they may have borrowed from other units, like VMF-124, VMF-213, VMF-215, VMF-221, VMF-222, VMF-223....which I think was in the neighbourhood at that time....
Edit: -215 was on Vella Lavella late -43, VMF-124, -221, -222 on Guadalcanal, -212, -121 Solomons, -211, -213 Russells,