I think I saw a thread in here a while back where someone came up with a hack to remedy broken bumper tabs (the ones that secure the bumper to the corner panels, aft of the headlights).

I had to remove my bumper about 2 years ago to replace the bottom plastic mesh piece and discovered one or more of the tabs were already broken, and I think both are now broken on both sides since then. I get a little gap there from time to time and have been able to push it in and get it to stay in place for a while, but it kept popping out. Then my indy had it jacked up by the front corners one by one the other day and now one side sticks out quite a bit and I can't push it back in. I'm hoping to find any easy way to secure the 2 panels together.

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Tim in Indy
2014 xDrive35i