Kroger interview questions

I put in a application online, was called to set up a phone interview. I had a 1 hour phone interview, basic questions. I was asked to come in for a panel interview, 3 people asking behavior based questions. Received a offer letter via email.

It wasn't an interview. They gathered about 15 people in a room for 4 hours and had the union guy come to talk. We signed a bunch of papers and listened to "success stories" as well as other opportunities. We filled out our employment paperwork, then got paid for the 4 hours we were there. There were no questions or anything like that.