Proof Mesira isn’t the Italian omerta . As always, ask your own LOR.
This tidbit is from the Aruch Hashulchan on mesira ( CM 388. #21:):
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Someone cheating on their taxes (which is muttar according to some poskim, but not the ones I follow) would not be in the same din as counterfeiting money. Someone committing insurance fraud is lechora the same thing as counterfeiting, which he says here is a mitzvah to tell the goyim. however, if you’re wrong you’re chayav misa and ein lo chelek leolam haba.
that said, the various infractions going on by kapparos is irrelevant, since the government doesn’t care either what goes on in Chinatown. It’s the halachic issues which caused my Rav to say to skip it.