(Now I can delete the screenshots I just took. )
Yes, I saw the Karner Blue! Two of them! (And that's where the Prairie Warbler and 3 other butterfly lifers came from.)
It is a little early in the year according to the staff people I talked to, but they are out for sure! Any sunny day from now through early to mid July should be good.
I found them very easily. I think despite being endangered that they are pretty common--at the Pine Bush. Just go to the Discovery Center--where the parking lot is--and take the blue&yellow trail up the hill. There's a little overlook, then go down the (tiny) hill, passed the do not enter on pain of death signs (they don't apply to the area further up the trail) and you come out in a big open area. Walk off the trail to the right and wonder around in the wonderful lupines till you see one.
You can also risk talking to the inquisitive staff in the building. They do know a thing or two and will be glad to give you tips on where to see it.
And did you not see this?
Go get 'em! Good luck! Let me know if you think of anything I didn't say.