Just an observation on the terminology: these aren't "cash coins", even though they are denominated "10 wen" in Chinese, which is usually translated to "10 cash" in English. The term "cash coins" is usually reserved for the cast coins with the square holes in them. These coins are called "machine-struck".
The two coins on the left are, for all intents and purposes, the same, though there is a minor die variety difference, comparing the size of the swirl on the flame-ball. The "large" one is slightly scarcer, but not by much. They are from Hupeh Province, and dated in the cyclical calendar to the equivalent of AD 1906.
Large incuse swirl and
small incuse swirl.
The coin on the right is from Kwangtung Province and dates to AD 1909.
Here it is.
They appear genuine to me. Fake common copper coins is nowhere near as major a problem as fake common silver coins, at the moment.
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