If you have any doubt about it being occupied or not you could put a notice at the door and say that its your property and that you will enter on a given date.You probably should provide a phone number so people may  call you. 

I was able to find one after spending an hour searching, it's impossible to get a hold of anyone over the phone, thank you for the advice

Make sure it is clear you're a interested in buying their house ASAP with your phone number very easy to see.

I'll take a cell phone but no computer.

You can simply go to the County clerk of court and in most cases simply fill out a "Quit Claim" form and pay the recording and admin fee which is usually anot much $100-$250 in most cases. 

I self manage my units, which I love doing, and therefore my tenants have my phone number for when there is an issue.

This is one spot where picking up the phone and calling people works very well.

We send reminders a week before, the day it is due, the day after it is due, and several more the week that they are late - its a mix of emails, texts and phone calls.

@Riley Yourdon make sure you put in your purchase contract that you will get the leases and rent ledgers BEFORE closing so you can review them.At closing you'll want to require that you get the tenant names, phone & email.There is this thing called fraud when it comes to leases & ledgers, so discuss reps & warranties with your agent.

Do all the records have phone numbers?