I think this is a bug? I read that this apparently happened to some people with some previous expedition reward ships, but it’s the first I’ve seen it. Steam version.
When I tried to claim the ship, my only claim option was to buy it for 1400 nanites. I hadn’t that much left, I basically spent all my nanites on minotaur AI and upgrades (because fuck having to fight yourself in this game). Since I couldn’t buy, I had a warning I would not be able to claim it later, and even though I cancelled, while I was trying to farm for nanites that game switched to normal save and I couldn’t claim anymore (even from Anomaly).
I’ve confirmed in another save that the reward is available, but since I don’t have that much nanites, I haven’t try claiming yet, just in case it got eaten up again.
If it was there and I missed it somehow (doubt it, I spent a while in the area patching up my minotaur etc), there is no reason for the buying interface to even show up. I think that definitely counts as a bug.