Not all raids appear on the Cyclopedia Map, unannounced raids are excluded from this even if you've fully discovered an area on the Cyclopedia Map. As long as the raid has a raid message and you've fully discovered the area you'll be notified an hour in advance of the raid. So you will be notified of Orshabaal. I'll leave my sources below.
"The notification of imminent (about to happen or announced) raids affects every raid that is announced via a raid message. (White text popping up on your screen, when the raid starts). Let's say you have completely discovered 8 areas. One hour before the raid starts, an exclamation mark will pop up on your Cyclopedia map which indicates that within that area a raid is going to take place. After some time, the exclamation mark will pop up in a subarea within that area to further determine the concrete location of the raid. Once the raid has started (white text has popped up on the screen), all players will see the exclamation mark on their Cyclopedia Map. Unannounced raids like the midnight panther are not going to be marked by an exclamation mark."
Source: https://www.tibia.com/forum/?action=thread&postid=38386597#post38386597
"If you have completely discovered an area and a raid starts in this area in one hour, this area will be marked with an exclamation mark. All you know is that there will be a raid in this area in the next hour. Within this hour the raid becomes more imminent and the subarea in which the raid will take place will be marked. The name of the raid that will take place will not be announced."
Source: https://www.tibia.com/forum/?action=thread&postid=38345465#post38345465
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