Back with a few more discoveries 
Found the unused bust of Lenin from Hitman 2:
A speed limit road sign (could’ve been used in a couple levels in WoA but maybe Paris?):
Park gate and column from open world Paris:
From the looks of it, they look like the finished version of the fence that would be placed all around the sniper tower’s park (we don’t have much visual proof so bear with me)
A painting from Bangkok (Hitman has paintings from A to H + K, this is variation I, I did not find the “J” variation in First Light):
This “hospital waiting room” chair that was made for Hokkaido before they switched to black leather ones:
Sand sculpture from Hokkaido (this is variation B, A and C exist in Hitman):
A protection for pressure bottles from Miami (right is for comparison):
Interestingly, this bottle is only used twice in Whittleton Creek despite being made for Miami, I wonder if there is old trailer footage of Miami where we could see them…
A red plastic bag for this yellow bin (normally empty if opened):
Since it is only used twice in WoA (Miami and Carpathian) and the only time you see one opened is this one in Miami, I have my own theory that it might’ve been used at one point when this bin actually contained an item (during the Beta of Hitman 2)
Unused Rosetta Stone from Isle of Sgail:
A bird bath from the Garden Show in Dartmoor, designed for the English garden side (since the model uses a complex material that I cannot easily replicate in Blender, I am showing it with no textures):
Another mysterious bird bath:
I’ve also found these two signs that are not present in WoA but since they could be used anywhere I have no interesting origin to share with you 
