stratman, thats very exciting...if in fact this is your long lost buddy, make sure to post pics of him when you get him back.

i would start by putting a small, short, open tank with mice in it overnight and see if they start disappearing. maybe just a few so he doesnt get a full belly. do this once a week like clockwork. if they start to disappear like clockwork, then you have the correct night to look for him. its been two years...another month of getting him to get used to feeding out of your tank shouldnt be a lengthy process.

and of course if you have a wildlife night camera that takes pictures of movement, this could help you identify what it is. just block the camera from taking pictures of the mice all night.