I know its not required by Indiana, but it is required by ME!
If they simply won't do it, I simply refuse to purchase said item. Always cover your a**, period.
That's cool and totally your choice. That said, it would be important to make that clear up front, before solidifying the sale.
There are those who feel that refusing to offer information beyond what is legally required IS covering their ass, period.
Myself, I could go either direction, but given a choice between buyers/sellers equally, I'll do the minimum required.
I am not going to be happy if you spring your additional paperwork requirement on me after I have driven to meet you.