Is it obligatory to return stolen money to the same supermarket, or is it permissible to return it to a branch belonging to the same company, and is it obligatory to return the money even if its value is small, such as 50 Riyals?

Stolen property, no matter how little, even if it is a stick, must be returned, based on the hadith (definition): "None of you should take his brother's belongings, whether in jest or in earnest. And whoever takes his brother's stick, let him return it." The money should be returned to the same branch from which it was stolen, as there might be a right pertaining to the employees there. If that is difficult, it is permissible to return it to another branch.