If I found a starter kit hanging from my mailbox EVEN AS A VAPER I would probably run screaming in the house (well, maybe not screaming) but I would be like, "Who is stalking me."
I'm just being blunt/honest here, but you know them best etc. I just don't understand if their friends, why the anonymity business? At least say they're from you so they don't freak out.
I have gut feelings quite frequently. I am also wrong oh, approximately 50% of the time, and while I don't totally IGNORE gut feelings, I also run them past my brain first. The fact that you are posting about it makes me wonder if you, too, are wondering about your gut's feelings. Because, you did ask for feedback.
My feedback is at least box em up and say they're from you (with a friendly note about how you had them, and don't need them) if you don't want the full on direct approach.
Is there a reason you feel the full on direct approach is somehow bad? When I've given away starter kits I have simply and directly stated, "I have this vape equipment I won/don't need/we've talked about vaping before would you be offended if I offered them to you, with the understanding that no, you may not try them now or even ever?"
It has been drama free 100% of the time. And you are correct that you can ONLY open your own mailbox, so they'd have to be "hanging" or in some other way affixed. Really, IMHO as ALWAYS, it's just as easy to like, talk to them directly.
Best of luck with what you decide and do report back.... I, for one am interested.
Anna