Since those are from a tv mounting kit there is very little chance they are zinc coated. More likely plain steel or cheap stainless, both of which could discolor in acidic wort but would not evolve any harmful products. I wouldn't worry too much. Give it some time and see what it tastes like. Worse case you've got a funny tasting beer but not much likelyhood that its dangerous.
Burn the village, then drink the beer!