I too shipped a package to our daughter and son in law in Lubbock Tx. I calculated the dimensions, went to UPS' web site and printed off a label.
The total shipping came to $32.30 which I charged to my Amex card. When I checked my card and got the charges, UPS added an additional $16.47. At first I did not recognize the charge because the tracking and reference #'s were non UPS standard. After searching the internet and stumbling on this blog, I realized this additional charge came from UPS.
I contacted them and they told me my package had been randomly selected for audit and that the measurements I declared when I printed the shipping label were incorrect and that the size of the package demanded a higher shipping charge. I asked what the dimensions were that they calculated in their audit and it turns out I was 1" different in my measurement to theirs. So they charged my card 50% more. I questioned this and got the entire $16.47 credited.
I was also "scolded" by the rep who proceeded to explain their atomic calculation for packages and dimensions and weights which the average person would have a hard time understanding. I suggested to the rep that UPS is opening themselves up for a law suit by arbitrarily charging people's cards after the fact. This did not seem to matter. My suggestion to everyone......
check UPS charges carefully. My charges came from UPS ADD CHARGES-US.
If you see something odd that you did not authorize, challenge the company. Don't just accept it.