I've been picking up and holding seemingly dead bees found in the snow for several years now, about one in 10 comes back to live a little while longer.
And I learned 'not to count out' any colony until June, or it starts to smell
Bees found in the snow seldom make it back to their hive, but it gives a beek an opportunity to inspect a 'live' bee for a while in the middle of winter.