How to get level 84 grand heist blueprints?

Hello,

i can only get dropped level 83 contracts in T16maps. How is it possible to get 84 contracts dropped?

Thank you

As seaman said, it doesn't appear to be possible - you can check here that there aren't any on trade with area level 84 https://www.pathofexile.com/trade/search/Affliction/DLnDdBgu5.

It's possible that if they are dropped in a t17 map from the Valdo's Puzzlebox, they might be 84, but since there are none on trade I'm not sure it's possible.