acuifex

i imagine that nobody even cares by this point, but i'll put my two cents in anyway.

tf2 leak has some references of "is_craftable_by_unverified_clients" that is only compiled into the game coordinator.
here are all of the references:
 

econ_item_schema.cpp
 2747:     , m_bIsCraftableByUnverifiedClient( false )

 2786:     m_bIsCraftableByUnverifiedClient = pKVRecipe->GetBool( "is_craftable_by_unverified_clients", false );

econ_item_schema.h
  641:     bool        BIsCraftableByUnverifiedClients() const { return m_bIsCraftableByUnverifiedClient; }
  
  707:     bool        m_bIsCraftableByUnverifiedClient;

you can also craft items with the script for a few tens of seconds, if you:
1) launch tf2
2) click the items button
3) exit tf2
4) launch the script without significant delay.

i guess it's some kind of message that the game coordinator checks on launch and caches for some amount of time, or a periodic ping.

i can't really run nethook since i'm on linux, but i can donate a few 100's of items to craft with, for testing.