Just to double check here, you did warm up the mouse after thawing it fully - correct? The use of a old blow dryer on an f/t rodent can be very helpful. Dries them off fully and helps give them a stronger heat signature for the snake to track, always important in non-living prey.
You're offering a second one? There's nothing wrong with 2 prey items for a snake that needs that but normally they are fed during the same feeding not many hours apart (or perhaps I've misunderstood your posts).