"... Broad-spectrum diffusion-type electromagnetic wave band shows no abnormalities."
"Stellar electromagnetic wave band shows no abnormalities."
"Celestial gravitational wave detection shows no abnormalities."
...
The alien artifact has been confirmed to have entered the Light Channel; this result was detected within twenty-four hours after the conclusion of the express delivery plan.
Indeed, the technological level of the alien artifact is higher than that of human civilization, but it's no longer unattainably high. From its materials to its energy and composition, human technology can, in fact, deduce it all. The only aspect where it surpasses current human technology is its disregard for the conservation of momentum and angular momentum.
Therefore, strictly speaking, the alien artifact is only one to two industrial revolutions ahead of current human technology, not utterly unattainable.