I would probably have said in the email, if we don't hear from you within "X amount of days" we will ship as stated in your original order.
After I place an order, I may be gone on vacation/called away to a family emergency or I am periodically displaced due to flooding, and not have access to the internet/computer.
So if I didn't respond to the email, I would expect there to be no changes to my order, unless what I wanted wasn't available. If I found out after I returned, that it could have been shipped cheaper? I might have been disappointed in not being able to answer the email, but I wouldn't take it out on you though. :D:D:D