Chatterbox parts are ONLY in Hyena Caches located in Spoiler: Show
Downtown East, Federal Triangle, and Judiciary Square
For the parts with each one being tied to a specific Zone, and the Blueprint is in Spoiler: Show
the side room in the vault at Bank HQ
Only after you have gotten all the other parts. That BP in your photo is NOT there for you to be able to craft it. It's is only there to upgrade the GS to your max should you happen to have one that does not match your GS.
As for the Merciless, it drops from Mission based Hyena Bosses. So go run Jefferson trade Center like the rest of us for that.
And the Ruthless/Lullaby BP you have were only supposed to be for people who pre-ordered the game at different tiers as they are just Reskins of the Merciless/Sweet Dreams respectively. However you could obtain the "Upgrade Gear Score" variants of them if you happened to play with someone who DID own them (it is the same for ALL the exotic BPs actually). But you yourself have no use for those blueprints except the ones that are in the game for everyone.
Which are as follows: Chatterbox, Liberty, Merciless, Sweet Dreams, Pestilence, Nemesis (BP for that supposedly coming in the raid we get on the 25th of April but parts are available as of now Spoiler: Show
From Invaded stronghold Bosses after you find the scope from dismantling the Adrestia SR-1 you find in Tidal Basin at WT5
)
In short, all those BPs in your bench(Except your Kendra's Liberty BP as that IS the one to craft it) are not to make the weapons but rather to upgrade them from whatever GS you get them at / craft them at.
Another thing to note is that Aside from Pestilence, Merciless and Sweet Dreams (with their respective Reskins Ruthless and Lullaby) because they are boss drops and not a craft-able exotic. You can only own one of that particular exotic. So once you get all the part to a chatterbox and crafted it, you will not have the pieces drop for you again from the caches until you deconstruct your current one.
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