You can checkout teambhp classifieds. I’m not sure, but some genuine deals might be there.
In olx, the description given by genuine owners will be quite different from the usual resellers. Usually resellers will have the same description in all their ads. You can apply some filters such as odometer reading, no. of owners, no. of years etc to narrow down the list. If you have the budget, you can also apply filter to see some like new cars (1-1.5 year old) at good rates.
Or if you have the budget and time, wait for Kia to launch their new MPV next month. Will be priced competitively.
If you’re looking for Innova AT, go for the pre-facelift 2.8AT. Engine is too good.