Any mice that get away from you will be much easier to catch in the larger container rather than running around in a mouse room. Have an extra cage lid handy to place over the opening of the shipping box. As you open the box, slide the lid into place over the opening and maneuver as needed to create smaller openings from which to remove mice. Unlike most common laboratory strains, wild-derived mice look for exits rather than running from light. Once your wild-derived mice are in your animal facility there are a number of factors involved in maintaining a successful breeding program.
Place pairs together in a quiet room, away from areas of heavy traffic and noise.
Handle as little as possible. Your Animal Technicians should be trained to handle wild-derived mice and should allot enough time when dealing with them to work slowly and patiently. Wild derived strains are more sensitive to stress from shipping, new surroundings and new handlers. When pairs are placed together, give them 8-12 weeks to settle down and produce a litter. If after 8-12 weeks a pair has not produced a litter, you can switch the males around to different females.