What is the most logical next event?

How to settle property line disputes
Hire a licensed surveyor.
A licensed surveyor will use the legal description contained in your deed to locate your property's legal boundary.
You typically can find a land surveyor by searching the website of your state's licensing board.

Possible answers: [i] If your land is located in a state with an existing boundary, you can start a search by contacting local county land licensing boards. Land survey companies in the state may also search property lines for you. [ii] Search through the online ledger of your state's authorized to record land surveys to identify your property's legal boundaries. In addition to providing a record of the land survey that identifies your property, you'll also need to provide a set of pictures that show where your property has been surveyed and the transaction that brought that deed to its conclusion. [iii] Expect to pay around $500 up-front for a land survey, although the surveyor's fees will vary depending on your location and the size of your lot. The surveyor typically will place posts or other markers to identify the legal property line. [iv] Depending on the state, you may have your deed on file. In some situations, a direct survey of the land might be more helpful than having the surveyor advertise in local papers or newspapers.
[iii]