It is incredibly easy to fake an email from any email address and other such shenanigans.

I have a promising deal in the pipeline through private sale but the seller requires the funds in no more than 2 years.

If the deal looks promising after stress testing then go for it. 

Because if they don't have the wherewithal to save some money over a period of time, in order to come up with the security deposit, than they are probably also only one "short" paycheck or "car repair" away from not having all of the rent for a particular month.In my early, naive days I let two different tenants pay me only half the security deposit, with the rest of it promised within one month. 

I agree the letters are worthless to a degree because the bank generating it doesn't promise any performance.

Review your loan documents to ascertain exactly what it is you promised to do. 

I promise, you will find the the answers you seek.

Stay on top of your tenants, don't let them slide on rent or promises.  

I promise you that's my real name.

Should I hire a person to stage the property, I have some couches and a few fake flowers"?"