There are maybe three things that could be done to check this story.
First, I just took a look at Griffith's Valuation for Wicklow, published 1853.
There are three entries for Ballymaghroe, in three different civil parishes. The one in Hacketstown CP has entries for both Michael and Matthew Neil - in separate farms. You can trace the subsequent history of these farms in the cancelled Rates books. Available in Valuation Offices, and in LDS Family History Centers. This is certain.
Second, could check to see if the lease was registered in the Registry of Deeds. If so, you will see the terms of the lease. Available online at FamilySearch for free. Possible.
Third, could check newspapers, to see if there was any mention. Doubtful, but possible.