Have I missed Viper Venomous Steel Sword?

Ok, first off I know I missed it. Just wanted that title so other people can see this if they're wondering where this fudge this sword is.

If you done the Borsodi mission where you are in the vault, then you missed the diagram for this sword. It is in some chest, and yeh I thought I looted everything like I always do but... That is the only known way to get it.

Honestly, this is stupid. I would never have had a save that far back. I only got the silver sword as I knew it would be the last quest provided you pick a certain option. I don't know why they decided to make you get these swords in certain ways but yeh it sucks so bad.

Also just a little note, that caretakers spade is awesome.