@ Mitchaa
The talk of possible mix up is due to suggestions they made a transmission stating "landing at Blacksod" and within one minute their position was actually tracked to the immediate vicinity of blackrock.
One of the reports concerning debris being described as found at Blackrock lighthouse attributes a comment to a investigation official to the effect that the debris may have washed up there. So, it must actually have been found at sea level, rather than 300 ft above s/l at the lighthouse.