I just bought a mini Cattleya at a show a few weeks ago and, upon taking it out of the pot, I discovered no healthy roots. I soaked it for a while just to be certain but, no, they were all quite dead. I am not too worried, though. I have been through this before...many times. I filled the basket pot up with LECA and staked the Cattleya on top. It has new growths at various stages so it will be perfectly fine by autumn. As I really like the little Cattleya, I am still very happy that the vendor offered it.
To be honest, I hate re-potting orchids from bark mixes. Pulling the little pieces of bark off the roots is quite irksome. I wish all orchids came potted in LECA.