That makes sense ! I've seen or heard about quite a bit of shenanigans both ways with high value card sales. Disputes about condition, authenticity, whether it even arrived if the tracking isn't clear etc.
As long as you're not the hamster in the wheel, it's all good 😀
I do lick a lot of envelopes.
lmao ! Yeah, that's why I use self-sealing Jiffy Bags and a lot of brown tape on boxes. If I had to lick an envelope for every order I send out, my mouth would be as dry as the Sahara 😁
Most of my orders are single cards. Envelopes are the most cost effective way to ship 'em. And, I don't mind the taste so much.