Just stumbled upon this site and thought I might offer a little assistance.
First of all, ancient Egyptian, ancient Lybian and ancient Nubian culture shared architectural, religious and stylistic similarities. At times, the boarders between these ancient worlds were blurred and their cultures transfused. Most people are familiar with ancient Egyptian art and culture but are unable to recognize the subtle differences in Nubian or Libyan stylistic protocols.
The two tablets displayed in this thread are probably not ancient Egyptian in origin. They might have originated in Lybia as the text suggests. If an association with ancient Egyptian artifacts can be established, then it could be speculated that these two artifacts were gifted to Egyptian nobility by Lybian nobility sometime in the ancient past.
A more pressing question to answer with regards to these particular artifacts is that of age.
A small number of academics have examined these artifacts and concluded that they are old and probably authentic. Individuals who label these artifacts as fraud, have not bothered to examine them. They offer opinion only.
Both images shown on this tread were taken in the basement of the physics lab at Brigham Young University in Provo, Utah. The person holding the artifacts was the director of the facility. His expertise is in the dating of ancient metal, and could offer no professional opinion as to the age or authenticity of the artifacts.
This discussion forum has ask who is Hyssar? Actually the name is spelled 'Kaisar, and refers to speculation that the image on these two artifacts is that of ˈgajjus ˈjuːlius ˈkaisar; or Julius Caesar as it's spelled in modern English.
The association with Queen Cleopatra VII is inferred due to this interpretation and also because other artifacts (associated with these artifacts) which refer to ancient Egypt, particularly Cleopatra VII and Cleopatra VIII.
These artifacts may or may not be authentic. The academic jury is still out. If authentic then one might assume the artifacts are valuable. The smaller artifact was at one time offered for sale (by it's owner at the time) for US$2.5 Million dollars. This was an attempt to demonstrate the value of the artifact if it could indeed be proved authentic. Many have pointed to this as evidence of fraud.
The larger artifact is obviously a fragment of an even larger original work. The writing can be seen running off the left edge. What script remains has been tentatively deciphered by Paul Kelly. His opinion is that this script represents acronyms and initialism often found in ancient stone inscriptions; much like ligatures seen in Greek, Latin, Arabic, Glagolitic, Serbian and other ancient script. This is simply a form of shorthand to make the job of stone carving or writing less rigorous. Such shortcuts where not only employed as a labor/space saving device, it was also considered clever.
These artifacts are available for academic examination. You may inquire about them at L478E@cox.net