You should try to find a place for the package that will protect it from the rain; otherwise, it’ll be ruined. We don’t know why the delivery person didn’t put it on the porch – maybe there wasn’t any shelter?
If you’re determined to store your valuables in the garbage bin, at least try to keep it inside a box. That way, it will stay dry – but not very hygienic. Your poor trash collectors don’t deserve having to rifle through smelly old boxes of who-knows-what. Let’s hope whatever is inside is worth the ickiness factor.