We believe it's a scam because he claimed $1,500 in clothes stolen, among them a $1,000 mink coat, and he's not the type to wear mink coats.Later on, had another tenant, and by then I required renters insurance.

I recommend you ask for it to be empty one week prior to closing so you can complete a final walk through a few days before closing to ensure the tenant hasn't trashed the place or stolen the fridge.

If you took pictures, recorded the serial numbers, Maybe you could track them down, recover and prosecute for the theft, after closing, since they were stolen from a property you were buying.

I have had cooper pipes removed from my property, appliances damaged and stolen, boiler, hot water heater and laundry stolen or destroyed.

Also how do you ensure they are secured and won't get stolen?

Not worth your energy unless something got stolen/damaged.

The copper pipes were stolen one year. 

They made sure the cars were not stolen and issued me a new title.Easy peasy and some extra pocket change. 

He is a guru but you can learn all about wholesaling from his merchandise.

While it was vacant waiting for a tenant, the stove, washer & dryer & some other fixers were stolen.