On a similar note: in "Prehistorik Road Trip", paleontologist Eileen Grogan remarks that shark fossils have a very characteristic smell. That's a human nose, talking about 323 million year old fossils.

Dogs being able to detect much more recent things does not surprise me at all

[0] https://www.pbs.org/video/welcome-to-fossil-country-mpoq6h/ (around the 18:50 mark)

There are anecdotal reports of doctors/nurses able to pick up certain typical "illness smells" from their patients. Not sure if it's ever been studied more in depth.