I've noticed them also... just assumed they were manufacturing marks left by the machines that folded or spot-welded the aluminum. Since I sandblast and paint my chassis with a hammertone-finish paint, I ignore them. If you're not going to paint yours, you might be able to use some metal polish to get rid of them. Or try BUD chassis, although I seem to remember seeing similar marks on theirs, too.
Bud
Bud
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