It's a mix. Sometimes UPS doesn't pick up all of the packages (though they often do), sometimes the warehouse generates the label much more in advance of actually packing up the shipment than they should have. Right now I suspect it's more the latter than the former, but hard to say. Rescheduling can also happen AFTER pickup due to weather conditions or other issues that screw up the ability for UPS to work at peak efficiency.
Or they really suck. Believe me, I have a list of their issues delivering this package and others from other companies. I order from Amazon, White Wolf, Wizard of the Coast, your company, because I have no gaming store in my area. UPS always screws it up. It is not just with you guys. The weather excuse is one of their biggest ones.
I know the business of sending out orders worked for a company that did that for years, UPS offered your company they best deal but they do not do the best job bringing the packages. You are hearing it now.
My father's business does not use UPS because they are late delivery, lose packages, refuse to deliver packages if a certain amount to be delivered in the area exceeds their unwritten quota even when the trucks are not even full.
I had to get a manager on the phone at UPS Corporate Headquarters and they tracked it down the other day. The distribution center here in my area took the package out of their truck refusing to deliver it for no reason. It was a three way call, the lady who was the manager of the distribution center could not explain why they took off my package out and refused to deliver it. The address was correct and everything. The HQ Manager could not get a straight answer out of the woman. He even commented to me afterwards he had no idea everything was fine. I explained to him this is not the first time this has happened to me.
It has not. I have had all this happen to me in Aurora, Colorado; Colorado Springs, Colorado; Kingman, Arizona; and now Thoreau, New Mexico. Same things happen all the time same company and only with UPS. USPS, DHL and Fed Ex treat me way better and deliver the packages no matter where I live with little or no problem and on time.
I would pay extra not to have UPS deliver a package if I had a choice. They are brown because their service stinks.