Bold cards mean you own the territory of what the card name is (E.G. Western Australia if you own W.A and it's green)
When you cash in a Bold card set, or a set with a Bold card in it, you get an extra 2 armies placed on that territory (E.G. you put a set in with a green bold Western Australia, and you get 2 extra armies on it)
Hoped that helped and didn't confuse you
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