Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with a purse and money) A wallet in a dream indicates a place for keeping money or secrets. Its fullness indicates wealth, and its emptiness indicates poverty. Losing it indicates loss of money or exposure of a secret.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) A wallet indicates a wife or a trustworthy servant. It may indicate a child.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) A wallet is interpreted as goodness and sustenance. Whoever sees himself finding one will gain sustenance.