Can an Artificer use Retain Essence on Magic Traps?

[Roog]

In other words, do Magic Traps count as magic items, allowing Artificers to re-use the XP required for their construction?

[Azerian Kelimon]

If you can disable 'em for enough time, it'd be reasonable enough. But it wouldn't work without disabling.

[Duke of URL]

Yes. But you still need to spend the 24 hours with it.