I have a mate who found his lost coastal by getting a few bird hide boxes and putting a hot water bottle in one and those microwaveable packets that come in the box of fish when delivered to the pet shop, ( they are used to keep the fish warm) Then he placed a defrosted mouse in the box and left it for the afternoon, then reheated and left for the night. Then next day repete. Took him a couple of days but by day 3, sure enough, here is this beautiful coastal lookin pretty stoked on himself for proving he can survive in the wild.
oh yeah i forgot, he put a towl in there so his mate had something to coil under and retain heat