Open limp on button, should I be concerned?

[Peter]

$30 + $3 multitable tourney. About 75 entrants, a little less than 50 left. We started with 1000 and I now have about 1500 and I have J8o in the big blind. Blinds are 15-30. The table has been pretty thight, I never had to show down my hand.

Button open limps, I am concerned already. SB folds, I check. Flop is J76 rainbow. I bet 60, button calls. Turn is another J, and I bet 150. Button calls. River is a brick, no flush possible, I bet 225, button goes all in for approximately 300 more. I call.

How'd I do?

Peter

PS: this is my first tournament, played it on empire. Pokertracker says I need the summary of the tournament. How do I get that?