You know what Ed? You have absolutely NO SENSE OF HUMOR. 
The handwriting samples of the o's, zeroes and ones are from the anthrax letters.
When writing small o's on the media letter, the writer wrote like a small child, drawing a circle and tracing over part of the circle to make sure it was complete. This is not happenstance, since he did it MANY TIMES. It's an indicator of lack of hand-eye coordination, as one would see in a child of about 6.
Yet, in the date on the letter, the writer writes confidently, even leaving the second zero open at the top. The writer shows no concern for completing the circle.
Bruce Ivins' wife ran a day care center, and there were children around all the time. Is that just a coincidence? Maybe. Does it mean anything? Who knows? The date is too small a sample to be incriminating in any way. But it would still be interesting to see how Bruce Ivins wrote zeros, small o's and ones.
As I said earlier, it wouldn't prove anything. The person who wrote the date could have been trying to imitate the writing on the envelopes.
You know what Ed? You have absolutely NO SENSE OF HUMOR.