The entire investigation was swept under the rug. However, rumors began to spread around the office. The environmental scientists that were added to the investigation did not keep there mouths shut about what they saw. As they were often misused and mistreated to bury bits of evidence(Literally).
The Government got wind of this and quickly eviscerated every environmental scientist that envied the government enough to spread these egotistical arrogant rumors. 

The government not willing to have any evidence or hiccups they simply passed the boy's corpse to the cremators. 

When the time came to Balm and cremate the boy's remains. The morticians found a marking on his spinal cord. Going to send it through the incinerators regardless, the older more experienced mortician stopped the process for a slight examination.

He fell to his ass in horror as his mind flooded him with memories from his first year working at the morgue. 

It was not the first time he saw this mark.

Once again he took a closer look to ensure his eyes did not deceive him. He then convinced his fellow mortician that this isn't normal they have to examine the body.

They put the body under the knife and examined the corpse closely.

The mark had the capital letter "S" and a clawed scratch on his back. The morticians were left perplexed. This was not a tattoo it was a scar. The Elder mortician has cremated tens of thousands of bodies. It was not the first time he saw this mark.

His worse nightmare just possibly came to reality.

In shock, he reported it to the undercover government authorities and explained his theory alongside potential evidence he's been keeping for years.

In his head all the evidence added up now. It finally made sense to him.

At least that's what he thought. He had no idea truly how little he knew.

The evidence alongside his theory was enough to convince the DSUF(Deputy Staff of the Undercover FBI Agency) to fund and file another investigation.

And thus a undercover search for these "marked" individuals begun.