Capitalization in Chinese
Those are numerical variant characters used on checks and similar document in order to prevent falsification.

There is no such thing as cased characters in Chinese, although case of course occurs when using Pinyin for transliteration.

You should also realize that ”uppercase” is the original form of Roman characters, whereas the minuscules were later added for easier reading. The term case comes from the literal cases where the printed types were stored: majuscules in the upper, minuscules in the lower.