I just went to the UPS Store near me to ship something that's 26lbs. and 51x20x10 inches. The girl there said it would cost $170 so I left. Then I went on UPS.com and created a shipping label for it using all the accurate information and it only cost $50. Can I just take it back to the UPS Store and drop it off? Did I miss something (I used the exact measurements and weight the girl used at the store)?