Date: 9 Elul 5579
From: Rabbi Moshe Sofer
To: Rabbi Simcha Bunim Ginz (Eiger)
The question concerns whether giving chametz to a non-Jew before Pesach with the phrase 'return it to me' constitutes a valid transfer. The Chasam Sofer defends the Dagul MeRevavah's distinction between various formulations.
Source: Shu"t Chasam Sofer OC §116