88 Jeep pinon bearing

There was a grinding and whining problem a few weeks ago. I finally found someone willing to fix it and upon inpection found out that I needed a wheel bearing on drivers front side. So he finally replaced that and there was no problem when he drove it. Then I drove it 3 blocks and it was grinding but no whining. Brought it home and I started to break it down and look at the problem, I found evidence that maybe he didn't put it back together right. I don't know how to describe what I found except things were not as tighten down as they should have been.