Yes, both those accounts should show closed, but the open status really doesn't hurt anything, the $0 balance & IIB are the important things.
If you were indeed late in April 2016 they can report that, as long as it was before you filed, they can't report a late after you filed.
I didn't think collection agencies could report late payments as there is no "payment arrangement"?
Sure they can, collection agencies are actually more agressive in reporting lates. When a collection agency purchases a debt or is assigned authoritty to collect the original "payment arrangement" is transferred to them.