The traces you see are more than likely just copper... the solder mask (protective resin layer) give it the off color. take a knife as scratch the protective layer off and it should reviel the copper color... if that is the case, then I would say that those boards are mosltly a low grade since the have almost no surface mounted devices and no IC chips.
If you scratch off the solder mask and see a gold color, then you you have to ask someone at BS...even then, the gold would be flash plated on top of copper and not very thick. I do not know how boardsort would treat such boards.
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