You can find the accurite thermometers near the outdoor section in walmart. They have a probe with them and are normally about 12 bucks. THey also measure humidity.

I dont think he feels secure. Your set up is VERY large for a baby and balls like small tight places.

Once you get a digital thermometer, double check all your temps and humidity. those dial ones are crap and dont read the temps you need them to be reading.

I would suggest presenting the room. If hes eating F/T, then defrost the mouse near his enclosure, maybe even on top of it near the heat lamp/CHE. Do this for 30 mins or until defrosted. (i submerge mine in water, and my girl gets fussy if they arent actually wet).

If hes eating live, then let the mouse run around in its own enclosure on top of his. (So he can smell it). do this for 1 hour for live.

After the time is up, offer the prey item in the opposite corner of the cage from where the snake is. dont just shove it in his face. If F/T, leave the item on a plate or piece of cardboard (so he dosent injest the substrate). and leave him be.

If live, hold the mouse by the tail with tongs or hemostats and wait for him to come to you, dont leave your snake unsupervised with a live prey item.