Hello and welcome.
You have two from Hupeh and two from Yunnan, but your coins are, sadly, like the vast majority of these Chinese dollars - modern reproductions. I am wondering what silver test exactly was used, because just judging from the pics the colour is not what I would expect silver to look like, and exactly the colour the non-silver fakes usually turn out.
If you wish for further evidence, weigh them. I suspect from the colour that they will weigh considerably less than the 27 grams they are supposed to weigh.
These fakes typically sell for $1 or $2 each down at the local flea markets.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis