I would get rid of him and move on, and chalk this up to learning.In the future, you might consider what we teach our clients:In 5 days, everyone on the loan gets a phone call, and an email reminding them they are late and asking for immediate resolution.In 15 days, everyone on the loan gets a phone call, an email, and a letter, demanding payment that day or an explanation of why they haven't paid and how they will correct it.

The common approach I've seen for a list of addresses of buyers is to send a postcard with an intro and brief explanation of what I'm trying to do for them.

Some things that come to mind are adaptations to some things buyers might do in a competitive bidding environment: Submit a letter of explanation to the buyer's agent explaining how you love the house and will find the perfect tenants/next owners/etc.Be the first and best offerPresent a no-strings-attached gift with the offerI'm curious to hear other suggestions.  

. - I'm having trouble following your explanation.  

What satisfying explanation can I give them?

@Joel Owens, thanks for detail explanation.

Thanks for explaning that.

Security deposit amountYou can find plenty of examples by searching for "tenant estoppel certificate doc" or exchange "doc" with "pdf" for more options.Here is an example and explanation: https://eforms.com/rental/estoppel-certificate/Some have a lot of legal jargon but this document does not need to be so detailed.

If an original is not available, you will have to provide the Court with an explanation for why you do not have the original.

@Jay Hinrichs Thanks for that explanation, that makes a lot of sense.