The chloroplast plastids, a double membrane cell organelle, contain anthocyanins.
This is where they're made and kept.
As a result of the foregoing, we can deduce that Anthocyanin pigments are not kept in cell organelles.
Anthocyanins are water-soluble pigments that are red, purple, or blue in color, depending on the pH, and give flowers and fruits their color (blueberry, raspberry, etc).
Water-soluble pigments such as carotenoids, anthocyanins, and xanthophylls are found in plant vacuoles (cell inclusions).