well, you would ruin the AP solution for one. when AP is first started, you may have added too much peroxide and this may have dissolved a MINUTE amount of gold. when copper was exposed any gold in solution would have plated out at that time and would be a black powder mixed with the foils, but the amount would be so small that you would not be able to see it against a dark stained filter even if you were looking for it. trying to get dissolved gold from AP is a waste of time unless you added an over excessive amount of peroxide and kept adding it at an amount that would hold gold in suspension.