I have four large size 5000 yuan, six small size, two printed in blue, and a 25,000 yuan printed in green, which I can't find listed anywhere. All say "The Central Bank of China and customs gold units. I know they have been devaluated. Any help would be appreciated. Note: the upper middle one doesn't have a date and is slightly larger. 1948 issue. 25000 yuan doesn't have a date. Thanks in advance for your assistance.