As far as ballet flats go, these are holding their shape quite well. Most have quarters that are collapsing but these are completely intact, at least from a distance. One major sign of wear is the fact that the insoles are missing, with the layer of cushioning that once resided below them pulling double duty. Since the white foam is fairly dirty, it's obvious these shoes were worn without the insoles for a while, instead of having had them removed for the sake of making them look more worn.
There's nothing much to see on the outsoles. They're fairly worn but nothing that renders the shoes unwearable. Considering how the wear on the outsoles is in line with the wear exhibited elsewhere on the flats, it's likely these spent some time outdoors.
The lining in the quarter of the right show is separating at the topline. I'm not sure of why this isn't also happening on the left shoe, although it ties in nicely with my theory that right shoes generally take more abuse than their left counterparts. Even if the wearer is left handed and that somehow indicates what foot takes on more of the body's weight, the right foot is the one that has to operate the accelerator and brake pedals, meaning the right shoe gets forced to do a lot more bending and flexing and moving around.