Can I ask why they have been boxed up for two weeks,if you are pairing them up let one pair out of there box at a time say for 30 minutes,lock them back up then let the next pair out,stops them getting stiff and also gets them used to where their boxes are.I sometimes let all the cocks out for a few hours lock them back in and then have the hens out,saves a lot of problems when they have layed if they know which is their own box.