It's simply amazing what developers hide inside completed games. Users at Sprites Inc. have discovered what appears to be lost 3D elements from Rockman EXE 5 DS inside the Ryuusei no Rockman 1 ROM.
Notable 3D elements include character models for Netto, Rockman.EXE, Netto's room and a full 3D Akihabara Town. Speculation indicates these textures are from a work in progress version of EXE 5 DS, one that aimed to be much "bigger" (in terms of scale) compared to the likes of the final product. Others have speculated (and this is a long shot) these textures were from an unused EXE 7 concept.
Check out the topic at Sprites Inc. for more pics and future discoveries.