Front Diff part question

In what is possibly my dumbest moment in history I decided it was a good idea to knock a front CV shaft out using a drift from the opposite side.

I am installing a 3-5" lift which came with 2 rear rhino axels. So for good measure I ordered the matching 2 front axels. After fighting with pulling the drivers front axel off for a good while, I finally got it out. So while it was out I thought it a good idea to use a drift to knock the passenger side out. BAD & DUMB IDEA! I knocked this washer out of the diff. So I then removed the diff and pulled it apart. This washer is pressed into the outdrive cup which receives the inner CV shaft. My dilemma is I am questioning put it back together because I don’t see what this washer does. Has anyone seen this or her any knowledge on can I go back together without this washer.

This is off my 2011 900XP

Thanks,
Greg

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