good to hear from you!
perry has given you some great thoughts!
another member (robo) i greatly admire here recently posted "Bees are survivors, but there is a difference between surviving and thriving......"
this is very true. we may never know why one hive survived and one didn't. so many variables.
my comments to your questions:
1~ wrapping with tar paper is not going to hurt your bees. in our climate it is a good practice. wind break and as perry said, some 'solar gain'. if you wrapped them with something else that totally insulates and causes moisture........different story. i wrap, never had a moisture problem from the wrap.
2 ~ mouse poop is very dark and little black turds. your entrance reducer will show signs of chewing or just chewed out for them to gain entrance.
in the future, consider using hardware cloth or entrance reducers to detour them. mice do stress the bees. if the bees are in cluster they may move out of cluster to defend the hive. in cold weather this is detrimental to them.
bee poop is dark brown, you will see this on the outside of the hive, on the top of the outer cover and on the face of the hives, you may see some on the inside of the hive. if it is all over the tops of the frames or the face of the frames, your bees may have succumbed to a nosema infection.
also, mice are very destructive in a hive.
3 ~ moisture-did you place any insulation on top of the hive under the outer cover? if so what did you use?
4 ~ entrance at the top bottom is a good thing in our climate. i do use entrance reducers at the bottom, open at the widest. i cut my inner covers open wider to about 2 1/2 inches to 3 inches. this helps them in the summer and in the winter months.
4 ~ feed......any feed needs to be directly above the bees for them to move up into. in our climate, sometimes they will not move side to side because of our extreme temperatures. no barriers. my humble opinion. supers full of honey should be directly on top. any sugar bricks directly place on top of the frames with a shim in place. candy boards with a hold drilled in it, not going to be directly above the bees, they have to go through that to get to the feed. revamp the candy board and use hardware cloth on the bottom, or just use sugar bricks and shims so the feed is directly on top of the frames for the bees to move to. they will cluster there and utilize the feed. (not a fan of candy boards, too restrictive imho)
5 ~ bees with heads in cells. bees will crawl into empty cells to help warm the cluster. they will starve and then freeze. did they starve? yes. why?
in our climate, they can and will starve inches away from honey stores simply because our weather traps them in one place, doesn't let up, and they don't move, or can't move. not sure if i made sense here?
6 ~ no pollen patty!
7 ~ you can re-use the frames per perry's directions, and the bees will clean up what you couldn't.
like perry said, chin up, and i say don't give up! we all suffer losses!