I have used them on my keychains for two or three years and have noticed one thing that may, or may not, be a concern for you using them when shipping a gun. That is, they "chirp", from time to time. I mean, they emit an audible chirp that I can hear easily while driving my truck with an air tag in the truck with me. Whether or not a crook could hear it inside a package I don't know. But, I have wondered if it were heard by a ne'r-do-well, inside a package, it might trigger the person to greater suspect that a gun is inside. I believe it's already common knowledge amongst thieves that the air tags make this sound.
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