Best AnswerWelcome to Fitbit!
Two possible explanations
1) If the Fitbit was turned on in the package, it would track the Basal Metabolic Rate of the default person plus any shakes/moves of the box.
2) If you set up an account in July, that might be your BMR calories.
I am not aware that Fitbit re-packages (in fact, based on what I have seen, I can say with 99% confidence they do not), but it is possible the the seller did - unless you bought directly from Fitbit.
Scott | Aviano Italy
Force, One, Charge, Charge HR, Surge - iOS
Take a look at the Fitbit help site for further assistance and information.