Most telecom providers have a compliance portal that only nominally engages with human supervision or legal departments.
You fill out the form from your computer using the department credentials, typically on a semi hidden webpage belonging to the either the provider or serviced for the provider by a law enforcement program (like FBIs LEEP).
Records are rarely returned to a court registrar for EDRs or any digital request, and in the case of a magistrate federal warrant they are frequently issued after the fact or by email. I suggest it would be trivial to get a real warrant, or real fake-warrant, by impersonating LE.
I have personally seen warrant discussions and approvals between ADAs and small departments take place over personal gmail, if this tells you anything.
More info (Krebs, I know) https://krebsonsecurity.com/2022/03/hackers-gaining-power-of...
Verizon LERT https://cryptome.org/isp-spy/verizon-spy.pdf