For property related documents, it is better to file in person rather than online for the reason that the recorded FIR should capture all the details of the document deed such as document number, registration date, registered at, property details with boundaries etc.
So your complaint should include the following:
a) Parties to the document.
b) Date of registration
c) Document number
d) Sub-Registrar office details.
e) Property description(schedule of property)
f) Property boundaries.
g) Document consideration (value of the deal)
h) Document where lost and how it was lost etc.
Once you have filed the above complaint, police will register the FIR and after 120 days police will give you a not traceable report.
Your paper advertisement should be published in 2 languages. English and Tamil( As the property is located in Tamil Nadu) covering Chennai and Bangalore( as document is presumed to be lost at Bangalore).
The content of the paper publication should state as follows
I, _______, residing at ____________, have lost the original sale deed bearing document number_________, dated____, pertaining to property bearing address__________ .
Any person who may be in possession of such document may kindly return to the _____, residing at __________,
Hope this helps