I strongly believe the status definitions are what you assumed them to be. The seniors can confirm on this.Im not sure if it is IP1 or IP2.
See below my status.
3/16/17 (IP1???)
Background check: Your application is in progress. The next step is to conduct a background check.
3/17/17 (N/A)
Background check: Not applicable.
6/19/17 (IP2??)
Background check: We are processing your background check. We will send you a message if we need more information.