Forgery Request At Work

Location: Maine, USA. I had my supervisor ask me to forge employee signatures on documents being sent to the state. I obviously declined. 10 days later, I received an application with the owner's signature clearly forged by the employee who had completed the document. I sent it to my supervisor and her supervisor, only stating "Please see page XX. I want to ensure everyone is on board before submission." My supervisor immediately went into action, calling out the forgery, stating that it was not the owner's signature, and asking her supervisor how to proceed. After confirming the signature was authorized, I proceeded. I'm sharing this piece to ensure my supervisor understands that signing on someone else's behalf is never acceptable. After this, I filed a formal complaint with our HR department. After a five-day investigation, they have concluded that nothing illegal occurred. They acknowledge that I was asked to forge signatures; they deemed it "unprofessional" but not illegal. They have said she was acting on the request of someone else - and "that is being handled." The determination call also informed me that my desk would be moved to an office around the corner to create space between my supervisor and I, and then I was questioned about my in-office attendance. I am mystified that we can acknowledge I was asked to forge documents that were being submitted to the state, however, not deem that illegal activity. Can someone please help shed some light on this? What am I missing here?!

Author: Away-Young-251