I have successfullyn kept several w/c lyers over the years. All of mine ate unsecented small mice. The Lyers I had kept originated from the Palm Springs area and Borrgo area in Calif.
Try this. Put a box
stuffed with cardboard in the cage. These snakes love to press themselves in tight crevices. By jamming themselves into a cereal box (or other box) like this they will feel secure and probably eat anything in front of them... Or at least in front of their box at night