Guesses?

A while back I purchased a 250 count box of dryer sheets.  I wrote the date I opened it on the box, curious as to how many loads I average a week.  I used one per load of wash and all loads went into the dryer as far as I know.

Would anyone like to take a guess as to which month in the year 2009 I opened the box?  I opened it on the first of the month.

I will just tell you that I was quite surprised!  I will post an answer tomorrow...and pass out the high-fives then!
Just a reminder...we are a family of four.