It's near the top of the `.rdata` section. `.rdata` starts at `0000000070C19000h`. Obviously I've added the name `EncryptionKey` in IDA. None of these things have external symbols.
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You will, however, also need to find the value `0x46D96FA8FAD5262B` hidden in one of two functions exposed to python as `get_file_index` and `normalize_offset`, and find the value `0x126E6680` hidden in a function appropriately exposed as `get_key`. The decryption is done by a function exposed as `normalizer`. Additionally there is code that apparently tries to delete ".rpy" and ".rpyc" files unless the global `i_am_a_donkey_4128` is defined.