Just Bought a new Glock 19...

Whether or not there was a fired case or not doesn't matter: All Glocks are test-fired in the factory. I can't tell for sure without pictures, but I'd be willing to bet the OP's Glock is brand new and hasn't been fired since the factory test-fire.
 
Personally I cannot see what the OP’s concern is, was the pistol made to fire cartridges? If so factory test firing or even a mag or two full at the shop will simply help mate new parts together. Back in the old revolver days I issued a new officer a S&W 66, he immediately complained the pistol had been fired before as he could see evidence on the face of the cylinder. I informed him 1. S&W proofs every other chamber before leaving factory and 2. Before the day was over the entire revolver would be covered with black residue along with both of his hands so “don’t sweat the small stuff”.
PS: I know of no manufacturer that cleans the weapon after test firing.
 
It sounds like proof firing and no they don't clean them after one or two rounds. Glock has lifetime guarantee should it ever need service. No need to worry, these really are the Good Hands People.
 
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