From: Rabbi Moshe Sofer
To: Rabbi Meir
The Chasam Sofer clarifies that sending one's own money to a Kohen through a messenger is valid delivery, not prohibited agency, correcting a widespread misreading of the Rivash. He further rules that one should not initially divide the five sela'im between two Kohanim due to a chatzi shiur concern, though the obligation is fulfilled after the fact.
Source: Shu"t Chasam Sofer YD §297