It seems unlikely that some CDs have HTOA and others don't. More likely you don't have any equipment that can play it. I don't think that many CD players these days can rewind into the pregap and same with computer drives maybe. Something like EAC for Windows will tell you if a CD has a Track 1 pregap at least but not all drives can read it.

Is this sold out everywhere now?

What does anyone think the chance will be that the muse.mu version will be different to, say, Amazon? In the past, it's been pretty explicit if there were differences, right?