Haven't you opened all four tombs when you first got there? In that case they will still be open. Otherwise you also missed a crusader helm and a dragon shield; good items.
If you dropped the key on the overland map it should still be there. Not sure if vital puzzle items that you drop in a dungeon won't disappear though. If you can't find it the only way into Mastus' Tomb I think is to hack a new key in your save file. Wyv might be able to help you with that. But on the other hand it's not that vital to do the warrior quest: the other two guilds have enough quests left to get to the highest guild level (7).
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