’14 850 reverse out (Not Chain?)

So, I recently snapped the reverse chain on my 850. Had it replaced. Now, there are a lot of factors here that I will tell you about, but I am trying to narrow it down. Really hoping it’s not what I think it is.

My guy calls me and says it’s done. I send my buddy to go get it, and everything works. He takes it to my other friend’s house for me to pick up. Meanwhile, this other friend drives it through a pit in his yard and everything works. While he is gone, a different friend drives it and gets stuck. He claims that once he was stuck he stopped and pulled it out with his truck. Says he never used reverse.

I get on it the next day, and reverse doesn’t work.

I know for a fact that reverse worked when friend #1 picked it up. I trust friend #2 when he says everything worked when he rode it. I’m not so sure friend #3 is being truthful, especially considering the amount of mud the 4 wheeler was covered in. Mud was packed under the front rack and in every nook and cranny. 2 hours worth of pressure washing and there’s still mud on it.
This leads me to believe that friend #3 may be leaving important parts of the story out.

Is it possible something went wrong with the install even though it worked fine when it was picked up?