Experts have translated this artifact (as with Facsimile #1) with completely different meanings than that of Joseph Smith.
The image represented by Facsimile #2 is a common artifact known as a hypocephalus; there have been more than 100 of these found, each quite similar to the other.
Hypocephali are placed under the head (or sometimes feet) of the mummified person to assist them in remembering what to say and do in relation to the trials they would face after death.
Facsimile #2 was damaged (as was #1) when Joseph Smith received it. He took it upon himself to incorrectly fill in missing areas as he felt he was inspired to do so.