SAM2: Sorry to disagree with you but the Sefer Taamei Haminhagim calls this minhag VADAI TORAH HU! It dates back to when Klal Yisroel entered Eretz Yisroel in Yehoshua’s time. The MOHN stopped falling on 16 Nissan after the Korbon Omer was brought. Klal yisroel now had to rely on the tevua grown in EY. Since HASHEM holds the key to parnassa it has become a minhag to shape the challah into a key.
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