Valid Source! While the exact details may not match the most popular versions of this story - the house being used (ie on an on-going basis) by an actual Bible Society - there is evidence of a kernel of truth from which this story came.
This evidence is found in the wikipedia article on Voltaire's* home in Geneva from 1755 - 1760 "Les Délices" (See in particular the paragraph:"After Voltaire"), which cites an article in reference to the question, by Rev. W. Acworth (1836) from "The Missionary Register." This article verifies the many refutations of the so-called anecdotal evidence of the source. The wikipedia article: "Les Délices" is about Voltaire's - (a nom-de-plume; real name: François-Marie Arouet) - home in Geneva from 1755 - 1760. It gives a brief history of the house; it's infamous occupants; & the - (mouseover reference 6) - reference above which iscontains a clickable link to the full article in GoogleBooks. This)
The article proves the truthverifies some of the questiondetails used to the 'refute' the original story (that this home was never used or owned by a Bible Society per se and is currently being used as a museum dedicated to whether Voltaire's life and works). This source asserts that the home WAS usedowned by the President of the Evangelical Societysociety of Geneva and used during this period as a repository for Bibles.:
I went through Geneva, and was much refreshed by meeting the Committee of the Evangelical Society ... The room where Voltaire's plays were acted ... had been converted into a sort of Repository for Bibles and Religious Tracts. - Rev. W. Acworth (1836). "Bible Notices in Switzerland and Italy". The Missionary Register (London: L & G Seeley) 24: 352
*a nom-de-plume; real name: François-Marie Arouet