No mailed check or pick ups.Purchase price 300k and owner is giving 20k towards upgrades/repairs etc Plan is to install surveillance cameras, lights, paint doors and shutters, 2 water heaters and new signage and minor fixes etc.

Chances are wherever the payments were cashed there's video surveillance. 

We have 24/7 video surveillance of all public spaces and no one ever entered his space.

No fees, no concern over cyber crime, just simple.

To prove anything about who the actual 6th person is who's living there currently, I'd have to set up video surveillance or someone watching the house in the mornings, or make an unannounced visit.

If there are weaknesses or this is an ongoing issue, put up surveillance cameras or bright lights to deter future crime.

And that was a long time ago, before it was really easy for tenants to have surveillance inside their units. 

How many of you have video surveillance covering the outside of your property?

Or always on the surveillance list.

And they are not dealing anything and anyway I have no proof of any wrong doing on their side.I installed a 24hrs surveillance system with a camera pointing directly to the entrance of their and 3 other units.