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Unique crypt boss can drop any unique regardless of level.
That's why it's listed at the very top. :)
I wasn't sure about the unique fishing rod, the only place I've seen it drop was the crypt map. I assume the Atziri maps can drop anything as well, so I listed them at the top. I'm fairly certain the uber Atziri map can drop everything, I'm not sure about the regular map.
Also, concerning gated uniques, the determining factor for one to drop is the monster level of end game map monsters. For example, it doesn't have to be a lvl 71 map for an Anvarius to drop. The boss in a 69 map can drop an Andvarius because it's a level 71 monster.