Anybody ever experience a rattle coming from behind those vents/pressure relief vents in the boot?

Mine will have a small vibration rattle, but I can control it with my AC. AC off, rattle, AC on, no rattle. I believe those vents have something to do with either recirculation, or general air flow to relieve pressure from air bags or shutting doors. Anybody every had that small panel off? If so, is it just held on with snap clips or something?

I laid in the back to find the spot of the rattle, it wasn't the bood latch or the other items. Thanks.