Same SOP to be adopted as for plot case.
In that case make an very strict sale agreement as per value of deal, get at least 30 to 40% advance as token and clearly mention on agreement that advance/token amount will be non refundable in any case if buyer steps back without any reason. Get this agreement registered in front of commissioner land revenue, then buyer cant claim amount from you if he steps back.
Fake buyer will not agree at all to register agreement in commissioners office as he also know it's not agreement on stamp paper only but its registered sale agreement and he is giving statements in front of land commissioner in his senses and to step back will not be possible at all.
Beside above, no patwaari can declare any problem in ur docs until its genuine, so better to sort out any issues with record in advance.
Thanks