What makes you think they aren't real? Who was the seller?
The measurements are spot-on and most of the finer details are in line with "real" Duncans, right down to the self-threading pole screws, mildly flat spot on the screw heads, and the "soft bullseye" (i.e. not overly smooth and not rigid lines) pattern on the slug poles. The baseplate holes and bends all look appropriate also. The bending marks on the mountings tab are a little more pronounced than usual, but not particularly suspicious.
What throws me off a little is the baseplate logo. I cropped this from the pics you posted...
The only 2021-production pickups I have on hand are painted black on the bottom, so I can't make out the logos that well.
However, here is a baseplate on a regular humbucker made in Sept 2020 for comparison:
And a Trembucker from late 2019:
The font on yours, particularly the "Seymour", and the ends of the large "S" have a slant, rather than the straight ends mine have.
That said, it does match the latest SD logo, so that may be a 2021 change:
Perhaps someone else has bought a pickup recently and can compare their logo before we deem them fake?
I have a feeling these are REAL, just with an updated baseplate stamping.