things can work well one day and break the next.i think you did all you could do. i'm not sure if there is a pressure test for sewer systems or not. i know the last house i bought, there was 99.99% saturation on one of the walls. i was sure that there was a leak in the pipe behind the wall. i called out a leak specialist and he said that he could detect even the smallest of small holes in a pipe. the saturation ended up being from the window sill being sloped and the water ran into the wall. easy enough fix.the $75 charge to have the leak specialist eased my mind, but in your case, if there wasn't even a faint leak or crack, i don't think you would have had anyway of knowing beforehand.

Detecting the note's position is fairly straight forward.Exit costs are too high - Exit costs are high and time table is long.  

Some of these properties are sold by realtors that have never rented a property in their life and they have no clue about reporting numbers so most of the deals go un detected by investors because they just don't have any data. 60% of my best deals are just taking the time to source the rental incomes and p&l statements/ photos ect.. where otherwise the deal would have never happened because no one had a clue about the ROI. 

I can only say what I did and it worked.My wife went a local detective agency, an internet earch of county records and such is a minimum fee,I paid 40 bucks, to find the un-signed wife.

That one is easy to detect because the owner's address on the assessor's site is the same as the supposed rental.

That seems the most logical since there is no monthly min.Regarding private eyes/detective haven't heard too many recommendations.  

I would not be surprised if they changed their name to avoid being detected through searches so NEVER pay upfront fees to anyone. 

You just have to play detective once in a while.

So they are financially misaligned on long-term performance (and I think this is why there are so many people who have had bad turnkey experiences) And, as someone who has done lots of rehabs directly myself, I have seen hundreds of ways that turnkey operator could take shortcuts (to the detriment of the investor but beneficial to their bottom line) which investor could never detect (or not until years later when it's too late).

If the unit is truly infested it should be possible for a layperson with a little knowledge to detect.