I came across a post in a Michigan community that mentioned this, and i asked if it really happened because it seems so crazy that Republican collaborators would directly mail in fake documents saying Trump won states he lost and I hadn’t even really heard about it.

But this is exactly what happened, as I found out today after looking for more corroborating sources:

https://people.com/politics/forged-documents-declaring-trump-pence-winners-sent-to-national-archives/

https://en.wikipedia.org/wiki/Trump_fake_electors_plot

Trump republicans in Pennsylvania, Georgia, Michigan, Arizona, Wisconsin, Nevada, and New Mexico forged false elector certificates and actually mailed in those forged electoral certificates to the national archives, that were examined and found to be forgeries, with trump, Rudy Giuliani and John Eastman as the ring leaders calling hundreds of Republicans to ask them to directly commit election fraud and forgery.

Some of them said yes. A bunch of them said yes, actually.