if your rear seams are missing , means someone bondoed them in , for some reason..
1) they may like it better flush (not very likely ,but not impossible)
or
2) probably in a wreck , fixed the tail panel....
mine was in a wreck once ,and one of the prev owners hasd it fixed...I have a seam on one side , not the other...

and now I need to go look, since I havent after I had a touch up...I think I told the painter to dig tat filled seam out??