If they push back and insist it's a misunderstanding, give them a list of your problems and what they would have to do to prove the information is reliable, then give them one opportunity to apply with additional information. 

Disclosure: I have only done this with MFR properties but according to the state it should be acceptable with SFR property as long as you claim holding it solely for investment and not your personal residence as you would already get a better deal.A few other slight perks of SC compared to some other states is the taxable value is not retroactively applied. 

This is compared against our own internal historical performance with similar properties in the same/similar markets in which we operate.

With a 4% rate on the seller-financed deal, you'll want to compare current market rates to see if refinancing is affordable and makes sense.

- If I were to buy in Indiana, how should I go about finding a reliable property management agency?

We compared 3 total bids.

He compares that to cold calling, where he was getting better results.

You should have a reliable and if YOU search for Youtube video (handyman unlikely to do this) as @Nathan Gesner recommends, you should be able to fix much cheaper.

Additionally, these investors can provide warnings about potential red flags, ensuring you hire reliable contractors and property managers.

ALWAYS do your own research on comparables, rent amounts, building codes and violations.