What sort of issues are we concerned about?

If the answer to both added questions would be "yes", then you have a potential goldmine here.Combining the seller's concerns, and the reality of a big down payment being a negative to the seller (see Q: 1), you should be able to set the terms, with a lower DP, and controlled interest rate, to have this property CF and,...be able to sell the package to another REI down the road,...as long as you buy this using an LLC (a new one). 

I wouldn't let any concerns about this deter you from investing in Section 8 (or other) properties.

If prospects upload ID, pass a quick background check, and maybe upload a pre-approval letter, I think that answers both the security and tire-kicker concerns. 

If all else take your concerns to yelp and social media. 

Here's what I've learned:Inspections Are Non-Negotiable: Always get a full inspection, but don’t stop there.Plumbing & Sewer: Have the plumbing and sewer systems checked specifically, as these are common problem areas in older homes.Electrical System: If the inspector flags any electrical concerns, bring in an electrician during the inspection phase for a detailed evaluation.

They aren't too concerned with the type of transaction (traditional homebuyer/seller or investment).

Or it could be that the recipient inadvertently dropped the email (it happens).But if two-way communication has been established and you’ve found that the sponsor is consistently slow to respond, that would be cause for concern.  

I do have a property manager on-site to address any concerns my tenants have. 

If the comps pulled are selling between 280-290k and are very similar, should I be concerned with the end goal of this deal?