You need to contact the seller. When you do, verify that they have your correct shipping address to avoid any unnecessary delays.You can see below for Estimated Delivery Timeshttp://faq.usps.com/eCustomer/iq/usps/re��
By standard flat rate, I assume you mean ground or truck service. 7-10 days to truck across the country is not unreasonable. Most major carriers don t run on Sunday and yesterday was a holiday. So your only looking at 5 days so far, I suspect you will have it sometime by early to mid next week?Do you have a tracking #, it should tell you where it is and give an estimated delivery date.