Just a quick comment, never EVER leave a live mouse in an enclosure with a snake overnight. The poster who suggested that was speaking of already dead prey. You're lucky that your snake didn't get chewed on by the mouse, so next time you attempt to feed, keep an eye on your snake instead of leaving it in overnight.
I never leave anything in the enclosure with my snake I have a empty 10 gallon I feed him in I took my bp out pit him back in his enclosure and put the rat in the empty tank