It looks like shipper error. There is no way a box of golf shafts can go priority for 15 bucks, and no one at a window service would charged and accepted an oversize (for priority) box of shafts at that rate. He slapped a prepaid on it or something.
In the interest of full disclosure, I worked at ups and usps years ago. I could tell stories about all of them. In my experience, UPS is usually slowest. Your package sits on weekends. If you order on a Sunday, usually works well though. But I had a UPS package take 5 days to get from Las Vegas to Denver, sit in Denver all weekend, fly to Dallas and back in the same day before coming from Denver to Grand Junction the next day.
The worst? UPS sure post. Low priority to end city, then goes in the mail.
I think I get the best results buying from the UK with DHL shipping. LOL