You began another thread in which the present question was addressed. Twenty and more years after the release of the Macintosh, the only evidence is what the Web and good sense can cobble together.
Wiki does list the ED variants as Macintosh ED and Macintosh Plus ED, but only as footnotes. One can be seen at the link that you posted. Some of the enlisted here have M0001ED machines, in beige and platinum, that mention ED only on the bucket, not the bezel.
The few pictures with legend on the bezel are all of platinum cases. Perhaps it was a late inspiration by Apple. Perhaps many of them live in the fabled landfill in Utah. Perhaps they were quietly junked from educational institutions when the 68030 processor machines appeared. Perhaps ... ?
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