Generally there would be evidence of the little critters.

I would say one of the things you want from the borrower would be the note on the first and evidence that payments are made each month.

So you'll have to show that you've made the payments on time for 12 full months (cancelled checks or bank statements to evidence debits on your bank statement to show payment).The 12 months of payment documentation will be required from the underwriter as a condition almost guaranteed 99.999%.Keep in mind what I am talking about here is if you pay an underlying mortgage that you're not obligated on and after the 12 month of payment you are "no longer," subject to the 50% LTV restriction with conventional financing.

the property for business or rental purposes....Here's the irrefutable evidence, however, for future passers-by....See:  https://www.law.cornell.edu/cfr/text/26/1.121-1CFR § 1.121-1 Exclusion of gain from sale or exchange of a principal residence. 

Can you please provide us with evidence of rent payments?

If you have the evidence that there's real damage to the unit you didn't see before you returned the deposit, try contacting the former tenant first with said evidence to work it out.

I can't find any evidence that would save money or pay off your loan faster. 

Retain all copies of documents you got from them as evidence. 

If you produce plausable evidence of what your claiming you definatly got a case i'm so sick and tired of the disregard for the constitution and the  disregard of basic human rights.

The evidence is there because the door frames and jambs are all busted.I'd like to setup security cameras at the entry doors and also covering the parking lot.