Re: julius ate prekilled!
Wait until your next feeding day, i.e., in a week, and then offer the f/t mouse.
Copied and lightly edited from rodentpro.com:
"Remove the number of prey items you need from the bag of prey. You can place them in a clean plastic bag and soak in warm water, or leave in the refrigerator overnight to defrost, warming up in warm water.
Always make sure that not only is the frozen prey thoroughly defrosted but that it is warmed up to a temperature above room temperature. You do not want your warm reptile eating cold prey, and warming the prey also makes it smell more strongly, and thus more attractive, to your reptile, and may be especially important when feeding reluctant feeders and when in the process of converting live feeders to killed."
Do not microwave the f/t prey - they have a tendancy to explode. Eeww! Don't worry about the prey being wet (if it is after defrosting in water). Your snake needs moisture anyway and damp/wet fur may help with swallowing as well.
Re: julius ate prekilled!
Actually if you use a decent ziploc small freezer bag you're f/t prey can stay dry. Sometimes also a quick blast from a hair dryer on high makes that f/t prey even nicer...toasty warm and yummy for your snake.