For example: The 060 in my A1200 has markings that indicate no MMU.
Yet the chip really does have a working mmu!
My 060 is an X and it has both MMU and FPU fully working.
CPU manufacturers sometimes mark processors which have a feature as not having that feature. This is (or at least was) done for a couple of reasons. Sometimes samples from a batch would have a functional core, but a feature such as the FPU wouldn't pass tests, so they couldn't sell it as having that feature. Another reason is it was more cost effective at some point to just make the full featured chip but sell it as not having the feature.
So, you might find chips which are marked as not having a feature which actually do have it. But I doubt you'll find a chip from a reputable manufacturer marked as having a feature which it doesn't have. In this case of this auction it seems like the chips are knockoffs or have been relabeled.
