ok with out know there is a queen and you going to install her anyway, I would put the new caged queen in the hive but not pull the plug if she comes in a wood cage or if she comes in the new plastic JZ cages I would leave the cap on, put the queen cage in the hive for about 4-5 days inspecting the hive every day making sure there is no queen already in the hive and after 4-5 days pull the plug or remove the cap and let them release her, they will feed the attendant which will feed the queen, they will be fine, it is like installing a russian queen in a italian hive, this will give you a few extra days to check so you want be throwing the queen away. just my opinion, its all you choice, Good Luck!!! I still think you probably have a young queen in the hive but its just guesting without being able to inspect the hive myself.