I Have Five Chinese Coins, Are They Legit?

Just off hand I'd doubt any of these are legit.
But taken one coin at a time with good quality pictures will get you better answers.
Don't think or expect that any will be worth much of anything.
I collect and document fakes and those sold to tourists as novelties, I see some here.

I find that, in itself, is often a telltale sign that the coins are fake - the nickel-brass alloys often used to make these fakes looks good in hand, but looks greenish-yellow when photographed.

And they are all fake. You have a mixture of relatively common circulation coins (like the "fat man dollar") to excessively rare patter coins never issued for circulation (like the yin-yang-eight-trigrams-two-dragons tael).

It's against ebay policy to sell fake coins, even if you're honest about it and declare them to be fake. You're likely to get your listing pulled and a reprimand from ebay. The theory is that the next owner might not be so honest (or might simply be ignorant) and try to on-sell them as genuine. There are also some countries where ebay operates (such as Canada) where the sale of any kind of replica coins is illegal.

It's not worth testing them for silver - there won't be any. I can guarantee it.

I was hoping for better pics to tell you more about your coins, but if all you want to know is if they are legit- they're not.
The 7-character YSK 5 yuan piece is a fantasy or novelty item. They were not made as a 5 Dollar piece, just the 1 dollar and smaller denominations.
The YSK piece with the 6 characters looks like it has the year 4 in it. This was never made in year 4. The 6-character legend would only have the year 3 in it.
Both of these are very common fakes and I have them in my collection. Your other pieces are also in my collection and are well documented as to what may be right or wrong about them.
If the bottom two pics are of the same coin, it has YUN-NAN province on one side and it looks like KWANG-SI (Guangxi) province on the other side, so those two don't belong on the same coin. Also in the back of my mind, I'm thinking Yunnan Province never made and Taels at all?
The 8 trigrams piece does resemble a legit coin that really was made in silver in 1858. It would be 41mm diameter, 2.75mm thickness and weigh 37.3 grams. Certainly your coin will not measure up and it certainly has no silver.
I overlooked another unlikely piece having Yunan Province on one side in English and having what looks like Chekiang in Chinese on the other side. So that cannot be a legit item. A legit coin would have the same province name on both sides. However in this case, as first stated, I don't think any legit tael would be Yunnan at all.

Don't sell them on ebay (or anywhere) if they are counterfeit or as they often say "replicas".

to the Community!