I found similar markings on my BE rear, though the stripes were front to back vs side to side. Also saw similar on a 9,000 mile unrestored COPO at Goodguys in 2019. First photo is from unrestored car, next are what I found on mine, third is my attempt at recreating the stripes.
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SOLD 1969 427 COPO Camaro Lemans Blue/Black, M22 4 speed, 15,800 original miles
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