Yes, it is odd. Perhaps any books he had at home were considered to belong to the Hanover Bookstore, which he maintained at his house and "was continued three or four years after his death by his wife" (according to Richard Husband).
A catalog of books for sale at the Hanover Bookstore was published in 1799. It's in Evans's Early American Imprints series, which I don't have access to.
The title is "Catalogue of books, for sale at the bookstore in Hanover, (a few rods fom [sic] Dartmouth College on the road leading to Lebanon.) : Consisting of a great variety of authors in divinity, physic, surgery, chemistry, philosophy, history, voyages, travels, geography, husbandry, architecture, novels, poetry, lives, memoirs, plays, &c."
(I'm sure if anything by Kircher was in that catalogue, Nielsen would have mentioned it.)