"I saw" is not correct, if you did not see. Likewise, "I have seen" is not correct if you did not see.
Furthermore, it is grammatically incorrect to begin with a conjunction, such as the word "but."
Still furthermore, it is grammatically incorrect to separate two words or two phrases with a comma when they are separated by the conjunction "or," as in "'I saw,' or 'I have seen.'"
Worse still is correcting the moderator of a forum.
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