The pieces in your scans are extremely common, worth 0.20/0.30 Euro each, those you can always find when you buy these large and cheap lots on eBay
or online shops, but they are not complete sets. For example, the one on the top left (I can't see it clearly, but it seems to be from Hubei province or Liaoning) is part of a larger set of 7 pieces.
In general, a standard set usually comprehends the 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50 Jin (broadely speaking, but there are many different cases or combinations). The "key" pieces are normally the highest denominations, difficult to find in UNC conditions, or the very small denomination (like the 0.05 Jin). I have some sets where the first 5 or 6 pieces are worth just 1 Euro each or less, while the last 2 pieces (the highest denominations) are worth more than 50-100-200 Euro. And until some years ago they were worth peanuts.