Cast? Please...
Second picture, fuchi seen from the bottom. Clearly visible silver solder all around the tenjo-gane. Evident copper reinforcement on the mune.
Third picture. Fuchi; the soldered joint is all around and vertical on the mune.
The kashira quality match the fuchi, so I assume they was made by the same person (hence the kashira isn't cast as well).
Now, let's discuss the quality (or lack of). The whole fact the soldered joint is so clearly visible on the top is by itself a sign of lower quality; the carvings are aligned to that.
The colour is strange, it could be caused by the pictures or the set is way too waxed (or lacquered, or painted, or worse).
When you receive the set please make some new pictures under natural (sun) light.