An example of $6k of value that an appraiser "can't" count could be something as simple as a vacant property where you get to do your own tenant screening, compared to another substantially identical fourplex that has tenants in place, tenants who you didn't screen, a lease you didn't sign off on that you now must honor, etc.

There are two identical units for sale in the subdivision.

@Quentin Mitchell didn’t you do an identical post before or was it your twin brother?

I like your idea of requesting a business card.The MLS assigns an unique number to establish your identity.

Hidden Identity - A manager should have their name on the lease as agent for ownerWall for Liability - You have PMs liability, workers comp, and E&O as additional layers of protection for things going wrong. 

Their identity is tied to it.

@Manik SewakIronically I just responded to another post with identical question but slightly lower amount.

If you were to compare the home on piers to an identical home on a concrete foundation,  would you expect the home on the concrete foundation to be valued much higher?

If it's a scam, it probably is somebody using their identity.

It's easy to forget when your first property in the area appraises high, you assume the next purchases are almost identical properties so will appraise at the same value.