These are very very rare circumstances.
1) you may first try and trace the piece of land that is there.
2) if it is occupied then you will have to file eviction suits on the current occupants but chances of such suit succeeding are rare because in all probability occupants over the land have been living for more than 12 years and are in adverse possession.
3) it also could be a possibility that such land due to no claim for a long time might have qualified as bona vacantia ie property of the state and now the state has decided to use it in other ways. under such circumstances you can't do anything. Even if you file a writ chances are that you wont get any orders.
4) you must find out the piece and parcels of the land and also the laws of the state in question regarding such transfer. there might be a possibility that the state under an act has decided to act in a certain way on lands such as these.
If you share the details of your RTI response and the name of the state where the land is then it might be easier for us to give you more conclusive remarks.