I thought political campaigns are required by law to disclose all contributions received, and organization/religions/companies are required, by law, to disclose political contributions.
Am I mistaken?
I believe the problem may be one of timeliness. The Church may be in line for criticism for not reporting these non monetary contributions earlier. In contrast to, say, the National Organization for Marriage (NOM) of Princeton, New Jersey, who reported $210,634.75 in non monetary contributions while the campaign was underway and Focus on the Family of Colorado Springs, who reported $83,790.00 --- no "non monetary contributions" were reported by The Church of Jesus Christ of Latter-day Saints until last Friday. I think, technically, as long as they file what they just did by next Monday, they're ok.
As an aside, one of the talking points I heard from several LDS sources right after the election, was that the Church proper contributed NO money to the Yes on 8 campaign, except for a small, roughly $2000 travel contribution.