It doesn't matter what some Common Eiders did years later. We need to know why, when they borrow established nests, they generally choose nests that aren’t maximally-protected from predation.

In other words, Common Eiders choose the wooden box nests because they can't find anything better. Woody vegetation nests are difficult to detect, which explains why Common Eiders choose the next-best option.

For this to work, we would need to know that woody vegetation nest builders are more defensive than wooden box nest builders. We don’t know that, so this isn't a useful explanation.

The stimulus doesn’t tell us that human alteration makes a difference. Besides, this doesn't differentiate the wooden box nests from the woody vegetation nests—they're both in altered habitats.

If predators are common, why aren’t Common Eider choosing the best-protected nests? This simply intensifies the paradox in the stimulus.