Something interesting about these. You have a five-toed dragon there. Traditionally, only the emperor could have five toes on the dragons in his motifs, nobles got four and three toes on the dragons of the common people. I have a Chinese wedding bed with three-toed dragons carved on it that is well over 100 years old.
That said, I do not think these are royal pieces, but produced later when decorating an object with a five-toed dragon was considered an OK thing to do and would no longer get you beheaded, or whatever the penalty was. Royal pieces would not have the slight painting flaws. They do look like they have some age to them though, I'm going to guess somewhere 1920-1950's, but with more research you could find out when it was permitted to decorate with a five-toed dragon and that should help you dial in the date.
I do not know the purpose for these, maybe some type of cosmetic jar? Caligraphy ink?