Its a little metal clip. They secure the hatch's plastic trim to the metal bodywork. One of several that are used. It becomes loose in its retaining slot. Mine has had it since newly new 2 years ago. Either the left or right vertical area of the rear hatch.
More likely to get further problems if they don't put the trim back on properly
It looks like this......
If not look at the strut's internals being loose.
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Week 43 Build has happened on time! 22 Oct'09 Scirocco is at Check Point 5 in the factory
23 Oct'09 Now Complete on the dockside, 24 Oct'09 Sailed from Portugal, 27 Oct'09 In the UK,
29 Oct'09 at dealers Driving 4th Nov. Sorted!