Article R733-3 of the French Code governing the entry and residence of foreign nationals and the right of asylum
When the administrative authority requires the foreign national to surrender his or her passport or any identity or travel document in his or her possession, pursuant to article L. 733-4, it shall issue the foreign national with a receipt in exchange for proof of identity.The time limit granted to the foreign national for his or her departure shall, where appropriate, be indicated on this receipt.