A lot of post office people around here know that i'm retired post office myself. When I bring a knife to mail or pick up a knife from the post office, it is in a sealed box. IF I happen to talk to a good friend I might say, yes, another knife.
That's as far as it goes. The clerk asks if it's anything hazardous. No, it's not. End of conversation.
As Calvin "Silent Cal" Coolidge said, No one ever misquoted me on something I never said.
I've experienced the same thing in the post office. Sealed box, and the guy at the counter asked the same thing....."another knife?".