Rattle coming from rear on passenger side?

[kubko]

Hi, I've recently started experienced incosistent rattle noises that seem to be coming from rear on the right passenger side. It's very weird and hard to pinpoint sound source, when I took passenger and he sat on the back, the rattle was gone. Might be a coincidence, but it also seems that on some days the rattle goes away on its own and I can't hear it. And the next day I can hear it again. I'm going crazy.

To explain the sound, to me it sounds almost like if something would be tapping with their nail against the glass or like some sort of creaking... It also doesn't seem to be affected by bumps, but more feels like inertia from driving through imperfect road.. I took a small recording while putting my phone on folded back seat. Maybe someone already went through same thing and found something. Car is 2017 Ecoboost.

Thanks for any tips.

EDIT:// The most similar thing I've found in this post's video, maybe the same thing is culprit
https://www.mustang6g.com/forums/threads/mystery-rattle-please-help.185946/post-3740438

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[GTP]

Do you have aftermarket toe links?