The likelihood that you will ever see a dime is super small.The best thing you can do is make sure to file the judgement with the county (or whichever area you need to) for the eviction as well as a judgement for the rent owed.

Box; rent can only be paid by deposit.For your convenience, the nearest location to your home is 123 Main Street, City, or you can execute a bank-to-bank transfer using the routing number provided.If you have any questions, concerns or maintenance issues, you may call or text my cell phone at <Google voicemail>, or you may email me at the address listed at the top of this notice.Please don’t hesitate to contact me with any questions about this transition or any other pertinent issue.

Purchase price or appraisal whichever is lower... plus you're more likely to see 20-25% then you are 15...

As @Ryan Paltridge mentioned, it is best to work with with someone in the area, ideally someone that is doing or has done what you are trying to do, as one would understand what you are trying to achieve and follow the Return/ROI/Cap Rate/Cash on cash return (which ever way you are analyzing your deal)  you are looking to accomplish. 

I use a google voice number to forward the calls/texts to our cell phones.

I dropped new-owner notices and 30-day lease termination notices at the entry doors of all tenants.However, one tenant does not have a job, cell phone, nor electricity.

Turns out they can do refi's but they will use which ever is lower between the original loan and new appraised value. 

My tenants have a Google Voice number that goes to my cell phone. 

I then use a skiptrace service to find the cell phone numbers. 

It's like insurance: would you pay every year a $1000 premium to insure your cellphone that cost $1000 and that you expect to keep 3 years?