First I understand what they are referring to, but it sounds like they may not understand the dynamics of investment properties and this specific kind of financing. 

You are not targeting those people.  

Unless you fall under the new JOBS act exemption for advertising, you will be limited to people that you know and have a relationship with.

It's been interesting, because lately a number of people have had this exact problem and we've been discussing it on this forum and personally with others we know. 

People don't like surprises.

We just fixed what needed to be fixed and made it a place people would want to live.

Or, potentially, open it up to more people with smaller minimums.

It's my understanding that certified mail must be signed for, and for a PO Box, that should mean going to the Post Office clerk with a note they leave in the box, showing ID and signing for it.   

Have you been going to local meetups in your area to meet other people flipping locally?

Are there non-disclosure laws that prevent transaction coordinators from sharing information with other people?