Just wondering, are the yellowy lines of what seems like filler-type material round back of boot (pictured) normal? There doesn't seem to be any damage repair on the exterior of these panels. Many thanks if you can advise!

Yes, they come from factory like this. sealant smeared over the overlapping joins of panels to stop damp getting inbetween the overlaps which will cause rusting and splitting apart of the overlap

Zero evidence of collision damage.

thanks so much guys that has put my mind at rest :))