While Poe and Allan had a complex and tumultuous relationship, there's no known surviving letter from Poe to Allan. It's possible that such a letter existed, but it was lost or destroyed over time.
It's important to note that Poe's letters to his other correspondents, including his mother, his foster mother, and his future wife, are often cited as evidence of his literary genius and his troubled life. However, the lack of a known letter from Poe to Allan may be due to the strained nature of their relationship.