Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 3 years ago

If there is a common understanding among people who attend the place that those who take shoes of others by mistake, allow using their own shoes by owners of the shoes which they have taken, the matter is solved.

Even if such agreement is not been declared in public but it is been understood as a matter of common sense, the matter is solved also.

Only if you know that the real owner of the left shoes (who is the person who has taken by mistake your shoes) does not allow using his shoes by you, then you need to seek his permission. This case is very rare.