have it tested with davao mineral laboratories or any mineral laboratory for that matter, bro. a qualitative test (what kind of metal that is ) will cost you more than 2,000 pesos.
to determine its purity (for every one bar), have it tested for quantitative test . it will cost you another 2-3 thousand pesos.
that is the only way you can be sure of what kind of metal that is. after it turns out to be positive, if it is, you can more than recoup your laboratory fee expenses. if it turns out to be negative, you are still benefited. it will save you from unnecessary accusations that you are peddling a fake item, even if you have no intention of doing it.