Is it permissible to dispose of an amount of 4000 EGP that exceeds the amount sent via Vodafone Cash, which was not personally deposited and has not been claimed by anyone?

If the questioner is certain that the amount deposited in her account by mistake does not belong to her, she must search for its owner. If that is not possible, the amount is treated as lost property and should be returned to the Muslim treasury (Bayt al-Mal) or spent for their welfare.