Just print your own labels on-lineand drop it off at the UPS Store. They will never know what is in the package. It is also sometimes cheaper that way too.
Most UPS stores will box anything you bring in even if they will not ship it. You then affix your on-line label and drop it off at the UPS counter or another UPSstore.
The UPS Store CANNOT ship complete "firearms"as this can only be done at the UPS counter. Complete firearms must be shipped via next day air and adult signature required. UPS prohibits the UPS stores from doing this for some reason.
The UPS Store CAN Ship parts!! It seems that the store you went to had their own policy. The store can also refuse to ship anything they want.