COPPER ARCHIVE RECOVERY PACKET
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The final vault was sealed by a tiny XOR routine.
Input is hex. Key is the first codename recovered in Level 1:
take the word after "SKF{" and before the first underscore.

xor_hex:
040202360e050a0c041802041b020b0d1017060e190c1b7f7f657f39

No external target is involved. Decode locally and restore the archive.