That other seller on this former listing seems to have had the same problem:
https://www.ebay.com/itm/184105123040?
The photo there looks more promising, and it's possible they had different lots of CPUs in the past (as that other listing also seems to have had), but the current ones seem to be non-functional as 286s at any speed (down to 10 MHz at least, and don't get warm, so I don't think they're 286s at all).
Same implausible lot and date code as the engraved ones (A50004 N1901) but with printed rather than engraved writing. Similar rough surface and smaller logo, too. (the pulse wave also has filled in pulses rather than just lines)
The pins are worn in a way that they look like socket pulls (no obvious signs of de-soldering or re-tinning, just abraded leads). So probably not fake, plastic leaded rectangles ... and also probably not new production failed/rejected parts.
The polished circle marks on the reverse-side corners have manufacturing marks for Malaysia and Indonesia and both those markings and the dimple on the pin-1 edge making look more like they might have originally been 68000s or 68HC000s. Given the faces have probably been resurfaces, I suppose they could also be Toshiba 68HC000s though I think Morotola used plants both in Malaysia and Indonesia.
There aren't enough reverse-side photos of PLLC 68000s to compare. I actually have some ebay purchase PLLC 68000s that look very similar, but I'm not sure those are legit either and had them on hand for a future project, but don't have anything to test them with currently. (though I could rig up a PLLC socket to DIP-64 adapter on a project board, I guess, and test it in a Sega Genesis)
Whatever they are, they don't seem to be remarked 286s (I think dead 286s would still get warm, too) unlike some earlier buyers received.
That first seller (same as the thread starter's ) mentioned contacting their supplier about the issue, so it may be a common problem on that end.
I've got some pics of these, and some of some working 286s (the A50004 J9724 may be a really good remark, but they all work at 20 MHz and work or at least POST at up to 25 MHz, so seems like graded remarking if anything. The logo size, font, printing color and surface texture seem identical to the original: the pulse waveform in the logo looks more rounded at the crests than my 1990/1991 vintage 286s, though). They also don't seem to tolerate 25+ MHz as well as the 3 1990 and 1991 Harris 20 MHz chips I have, but that could just be coincidence or related to a greater demand for genuine 25 MHz parts in the late 90s, at least proportionally to 20 MHz demand. (ie if those are real 1997 parts, they're less conservatively rated at 20 MHz than older 20 MHz parts)
If someone has more experience working with PLLC 68000s, you might recognize them. (I'd think Tiido might be able to)
Just a minute, it seems I forgot to take pictures of the reverse side. (that odd melted/glued 'B' marking was also on some of the other batch of bad 25 MHz 286s)
Edit:
All 4 are marked Malaysia (maybe one of my 68HC000s is marked Indonesia) the 1990, 1991, and 1997 date coded 286s are all marked Korea and have white printed serial numbers (or some sort of code) on the bottom.
The two chips on the far left are the real 286s (one the 'probably not remarked' '97 one from the previous photos, the other is a 1990 one pulled from my PCChips M205 motherboard, not the N9146 one from the previous photos), the 4 on the right are the 25 MHz remarked ebay ones.
And on second look, those 'B' markings almost look like ball point pen markings, or have a similar color to dried black (slightly reddish) ball point pen ink and are smeared/dipped like roller ball markings, but there's way too much ink there to be a normal ball point pen. (looks almost like the marks you get from a leaking/failing ball point pen where the roller ball has gone loose)
Poking around a bit more, the Malaysia marking would be consistent with Motorola manufacturing. (though I'm still not finding much in the way of exact reference photos of the back sides of PLLC 68000s or 68HC000s)