I will post them too, because I really planned this, so..
There's really a difference in ide flags between pc and ps2 versions of these objects. I've looked only for the ids 16448 and 16370.
12128, des_nt_buntpoles01, des_ntown, 150, 132
16448, des_nt_buntpoles01, des_ntown, 150, 196
pc extra flag is 64
64 flag definition says:
Disables the shadow mesh to project a shadow; allow transparencies of other objects, shadows, and lights to be visible through this object.
12050, by_fuelfence, des_boneyard, 140, 2097156
16370, by_fuelfence, des_boneyard, 140, 2097220
pc extra flag is also 64
thank you for finding info about some other objects with the same ide flag problem.