Blooping sound from the rear over rough roads

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Hi guys,

I have a B200 Chrome 2012 model, mileage now 100k, recently there seems to be some blooping sound, sort of like a hollow knock whenever I go at low speed over rough roads, at high speed it's much less significant. It's not a squeaky sound so probably not the suspension and the car also does not bob up and down. I thought it was the stuff in the boot, I emptied it all but the sound persists. It seems to be getting more pronounced. Someone told me it could some leaky valve or the shock absorber. Any one has experience in this? Thanks.

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Maybe check if the rear seats fold down clips are loose? Previously got bros mention the clips loose causing noise. 

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