War & Peace in the 4.5 Mailbox, but I already own the weapon. Safe to claim to not break the game?

I already own War & Peace +9 weapon, but the Mailbox is showing me this weapon again.
I am afraid that if I take it, it may override my existing weapon or downgrade it to the basic version.

Report back to me, if something got broken.

Thank you.

It’s fine. I accepted that bunch of mail rewards and I’ve still got my War & Peace +9.


Why do you think would it be any different than buying a weapon in event tiers that you already own?

Who knows? Bugs happen.