Also once the tenants move out, provide them with the documented evidence (take photos of the trucks on the lawn) and tell them you will be taking them to small claims court.

What's the evidence that they're mentally disabled? 

I would talk to a lawyer, see what your options are, and in the interim start documenting everything (dates and times of ambulance rides, behavior, even video evidence) and building a case for eviction before offering cash for keys.   

Now that you mention it, I have no evidence to show that the county processed the separation, apart from the selling attorney telling me that.

(Examples of evidence of illegal activities may include a conviction record, former landlord references, etc.)Any member of the household is subject to a lifetime registration requirement under a state sex offender registration program.

Evidence suggesting a courteous person who is generally clean and well kept in appearance, and demonstrates truthfulness, reliability and follow through on and during the application process.At landlord’s discretion, compensating factors such as an additional security deposit or co-signer (guarantor) may be required for qualification if Applicant fails to meet any one of the above requirements.

Tenant should have at least one recent Landlord reference with the animal so you have evidence their animal doesn't tear the place up or pee everywhere.

I don't see any evidence of visible mold.

I might leave the evidence or take a picture in case they state (as they will) that they never do that.

Combine this with evidence that the property has been abandoned: disconnected utilities, tenant moved out, most possessions removed etc.