Introduction
GCU Grey Area uncovered the following information for us.
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Note that other items with Spacefly in the name exist so take care to be looking for "Spacefly Eggs (authentic)".
Mission details
The related mission is called "A Healthy Enthusiasm". After returning to the NPC offering the mission with a crafted collection, you can either exchange it for the opportunity to purchase a Particle Repeater Mk3 or sell it for profitsss.