Contacting SUPPORT is the ONLY way to get help either of these locations. They are NOT supposed to be part of the game & thus no one can gel getting last tiles, etc. I know they're working on a fix but said to refer players to them.
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Anyone who's having whatever issue in the Mysterious Tomb of Excavation Site are simply going to have to contact SUPPORT. Most likely the response will be they're working in a resolution & players will have to wait for that fix. No one here in the Player Forum can do anything further to assist in this matter.