The following sites have already been studied for dozens of years and are well known to researchers of the Negev Highlands. Their dates and essence are still disputed because of the absence of unequivocal finds. The seal that will be presented in the lecture and which was found by chance in the fortress in Nahal Boker, near Sede Boker, rather than in an excavation, may be able to contribute to clarifying the abovementioned questions.