You'd think they might have noticed is an article in Resident Evil Recollections. It was uploaded on 5 October 2015.
When Jill and Parker finally find Chris aboard the ghost ship Queen Zenobia in Resident Evil Revelations, they're somewhat surprised when his head falls off. It turns out they were lured there by a dummy.
I can't help that they should have noticed sooner though, even though it was dark. I guess Veltro must have some REALLY good makeup artists working for them.