YES

After a few minutes Jacobs goes and gets the real doll and brings it down and lays her on the ground and also lays real Walter next to her and starts trying to spot any differences he doesn't see any clothed, so he starts stripping them both and feeling them and moving them both checking everything and activates both voice modules and they both sound the same and respond the same, so he inserts a finger in all holes of both dolls causing them both to react the same so he can't tell which is real one he then stands them both up.

Walter

Real doll

Jacob then hears his mom get home and dresses both and takes one back to his room.