Pictures were taken! Page 11 of the autopsy report says pictures and x-rays of the skull were obtained. But I couldn't find, in the autopsy report, anywhere that Dr G said explicitly that the tape covered both nostrils and mouth. Maybe she said it somewhere else.
In trying to get a better idea of the placement of the duct tape I used the following excerpts from multiple pages from here:
http://i2.cdn.turner.com/cnn/2009/images/06/19/caylee.anthony.autopsy.pdf
"Although there is no trauma evident on the skeleton, there is duct tape over the lower facial region still attached to head hair.
Dr Goldberger and Dr Garavaglia removed specimens for toxicologic examination, including strands of head hair measuring approximately six inches in length which were tied at the proximal end (near the beginning or point of attachment). These were teased from the mat of head hair which was present initially underneath the skull. . . ."
"The mat of hair which was initially found beneath the skull with strands of hair extending across the calvarium (skullcap or roof of skull) and face consists of medium brown hair. Some strands of hair could be teased from the mat and were at least 6 to 7 inches in length. There were various small defects within this mat of hair, presumably from insect activity, and there are multiple small roots growing through the mat of hair. . . ."
"The calvarium (skullcap) is totally exposed and there is only a very small adherent of soil and leaf litter. No soft tissue remains. Multiple strands of medium brown straight hair extend over the calvarium (skullcap) in the sagittal (vertical plane passing through the body from front to back) and coronal (vertical plane that divides the body into front and back) planes. They are attached to a nest-like mass of matted hair which covers the basilar (base) and lower posterior (back or rear portion) skull, including inferior (below or bottom) portions of the mandible (lower jaw). Plant roots have grown into and over the surface of the hair mat. Attached to the hair and overlying the posterior (back) mandible (lower jaw) and maxilla (upper jaw) are several pieces of overlapping gray tape. The tape has an open weave fabric backing and is delaminating (splitting into layers). The tape is removed and allowed to dry. The matted hair is removed from the skull. Plant roots permeate the mat and there are multiple small roughly circular, irregular defects in the mat, suggestive of insect predation artifact. The hair is permitted to dry pending additional examination. Preliminary examination of the skull reveals no evidence of trauma."
This describes to me a complete tangle of duct tape and matted hair that is interwoven with plant roots covering a great portion of the skull ~ mostly the bottom. It sounds like the matted hair was so entangled with the jaws that it helped keep both the tape and lower jaw in place. But maybe this helps give us a better idea of where and how the duct tape came to be still attached?
Oh, sweet Caylee, I am so sorry . . .