Once upon a time, a broker showed a lot to a prospective buyer.
Another broker owned the listing (listing broker), so it was the first time the buyer and his broker (buyer's broker) saw the lot.
The buyer liked the lot and proceeded to purchase it. The transaction encountered a couple of hiccups, but eventually, the title transfer was completed.
Months later, the buyer showed the lot to his architect to help him envision his future house. The architect seemed bothered by something but kept quiet.
A few days later, the architect called the buyer and said they had bought the wrong lot. The lot they purchased was the one across it.
The buyer complained to his broker, who called the listing broker. The Listing Broker claimed that the village's security guard said it was that lot.
Lesson:
When purchasing lots, do what banks do. Have the lot plotted by a geodetic engineer or procure a copy of the subdivision plan submitted to the Land Registration Authority/Department of Agriculture and Natural Resources. This is especially true for subdivisions built prior to the 21st century and raw land.