RE: "expressing transgender and anti-fascist ideology."
"A senior law enforcement official with direct knowledge of the investigation cautioned that the report had not been verified by A.T.F. analysts, did not match other summaries of the evidence and might turn out to have been misread or misinterpreted.
In fast-moving investigations, such status reports are not made public because they often contain a mixture of accurate and inaccurate information."
www.nytimes.com
That looks like something shaped in sand.
It is! Google pufferfish nests!