She did sign a notice of vacating the aparment and on the day she moved out she signed a form for her forwarding address saying she dropped off her keys on Aug 31st.

Confidence and knowledge is key.

Set up some key words like "colorado" so you can keep up on what's happening in your area.

Next time, try to follow the lease, guidelines and laws.1. collect first, last and sec dep (if you wish a lock/key fee too). 2. if lease states monthly, collect monthly.

For example, you set up key word alerts. http://www.biggerpockets.com/alerts

I am 20 years old and graduated high school with the honors of both Valedictorian and Student Body President ( graduated with a small class of 122 students)I have been involved in investing for about 2 years have assisted with flipping my brothers homes @Jordan Atkin ( approximately  20 homes in 2 years) during this time frame. 

You can either offer him cash for keys which might be the cheapest way to go or you will have to evict him. 

For example, you set up key word alerts. http://www.biggerpockets.com/alerts

I suggest you listen to the podcasts, set up some key word alerts and jump in on the forum.

Ill set up those key words asap!