The Last Photograph

The Conquest Museum on the Zagitz homeworld has many exhibits, but the most popular is the last remaining human DNA sample.
Drones guide their podlings to the guarded platform for a peek at the vial in magnetic suspension.
The thing is, that’s not the real sample. It’s just for display purposes.
Some claim that the real sample is in a research asteroid where the government is cooking up new batches of humans to stage fake invasions.
But the truth is, there’s no human DNA left. The humans were annihilated decades ago.
The conspiracy theory makes a good bedtime story, though.