has anyone tried "braining" a mouse with success?

[Maixx]

Tried 3 sizes: pinky, fuzzy, hopper. Not even a little bit interested, he almost looked like he was trying to hide from it. I set one on top of the log in the warm part of the tank where he likes to hang out and left for a couple hours, when I got back the mouse was gone and I started rejoicing- but he had just pushed it off so he could sit there. I found it behind the log upon further inspection. The fuzzy was the only live size I tried. I got it from the pet store I got him from, he was raised on their pinkies.
I wouldnt have the heart to brain a live mouse, ew... it's freshly killed. The same fuzzy that i tried live.

Do you trust this pet store? The crew at the local Petco is told to say "2 days ago" if they are ever asked about when their snakes ate last. I believe that the snake I got from them never ate, and is a very problematic feeder for me. She will only eat fresh killed mice (or live but I'm in the group that refuses to feed live).

Did the vet do a fecal exam. They can also give injections of vitamin b to stimulate feeding, and make sure there are no parasites that could be stopping him from eating.