As we have discussed it in PM, the paint chip off occurred between the hallway transporting Han in carbonite and shooting at Luke scenes (these were shot first with Boba Fett in ESB) and the bounty hunters ensemble on the star destroyer. Another weathering that appeared between these 2 scenes is the small white smudge on the left upper mandible:
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Another area with scratches occurred between takes was de front of the dome:
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I think I will add the peel off paint under the rear keyhole as an optional feature on my ultra stencils.