Stickers are shipped from Australia, so if you’re in Australia it shouldn’t take more than 1 week. If you’re outside of Australia it should get to you within 3-4 weeks.
I use stamps so there’s no tracking, and for some reason the Shop app just won’t update the status without entering a tracking code even though I mark it as ‘fulfilled’. Please check your email for a shipping confirmation email to see if your order has shipped.
Inside a plastic bag, inside a cardboard envelope, Ace Ventura in the rain would not be able to damage them.