Couple of options, if you bought it from a local dealer, they "should" ship it for you.
If it's not a local buy, ask for a shipping label from Kahr, and UPS is generally more open to shipping. Like posted, the local UPS store can't do it. But the main hub will.
Get a return label from Kahr. Box it up, get a tracking number, and check it online. UPS will drop off a "slip" at your house, than just go and get it.
Been there done that, with my Sig556, Walther PPK/S, and S&W 1911 for some "upgrades"..
As m25 posted, contact Kahr, and get a Return Label from them,...they should have ZERO issues with this.