They don't answer the phone when they know they are stuck.

When you get them on the phone setup a time to do a zoom call, see how they do business, who the connections are they have, and if you get to know them through those conversations and feel good go meet them in person.

Get a spiral Binder and write down everything in that binder as well as take pictures with your cellular phone.

I would observe the testing process and that it's sealed before shipping out.

Why not phone the city and ask them who to talk to? 

It would only take us 2 phone calls to put those in place. 

You need to also have the resources necessary to seal the deal.

I have a phone consult with a tax attorney cpa tomorrow, hoping to determine capital gains if we sell but wanted to get some thoughts first. 

I’m free all day today to talk on phone.

I would love to connect you with my broker who is also an investor in Oklahoma City and hop on the phone with you as well to help pinpoint concerns you may have and provide more clarifying information if you're interested- I do also understand if you have a lot of agents in your inbox or one's you're comfortable with already so this is no pressure at all!