Maybe the envelop is cut in half because it was addressed to someone besides Bukowski. If it had been addressed to him, wouldn't the signature half have been kept attached to the address half? Any guesses as to possible legitimate reasons for the cutting? I once sold a real Buk letter that had the signature and drawing cut out. I knew why: my friend, a small press editor, who received the letter, used the original art in the paste up of his magazine. He could have photocopied it and used that for the paste up, saving the letter, but in those days not many were thinking a Buk letter with art would be worth big $$$.