Mike

I wouldn't know how to grade it but i'm mindful that the tracings on a board are pretty thin. More a foil sandwiched between layers of something like fiberglass. Most boards have copper tracings. Some have copper tracings with gold solder points. Some have gold or silver tracings but they are uncommon.

Who knows ... it might be something or maybe not all that much really. Seeing as they generally have to refine boards by the ton in order for it to be cost effective to recover PM's ... i'm inclined to think it's the latter.