Tenant not responding and appears to have moved out

[Brian Pfaehler]

I am located in Indiana and I have been a real estate investor for over 15 years. I've never had a situation where a tenant just moved out after the lease was over, especially since I was talking to them just two weeks ago. I can't get a response from email, phone call, voicemail or text message and I drove by the property today and it appears to be mostly vacated. What are my options at this point? May rent is not paid, the lease was expired at the end of March, and I'm ready to change the locks and get it ready for the next tenant. Do I have an obligation to do anything at this point? Thanks for the help...