I actually think this started from the fact that the document dump reporting results from the forensic examinations contains results from all other stated evidence inspection *except* for this particular examination.
That is, the documents are provided in a pattern similar to: "notice of receipt and request" followed by "results of examination". In all of the rest of the cases, ie: the trunk trace evidence, they have the trunk trace evidence notice of receipt and request, followed by the results of the trunk trace evidence examination (no blood found). In the case of this particular item, they provide the notice of receipt and request for LA tests against Caylee, but they do not have the results of the examination.
Hope that clears it up a little.