You are right of course; it couldn't be Mary.  If you think of someone you know who has gotten a wand in London recently please let me know, perhaps together we can figure out who it is.  Do you think he sent other letters to other girls?

I felt a small measure of obligation to respond at first but I certainly won't now.  Even as strange as it was it felt rude not to but now that I know he is sending multiple letters I'm sure the burden of propriety has been lifted.