You're probably right. Maybe try the US sweet shops around town (美國雜貨) or A&M
Iherb?
https://hk.iherb.com/pr/Epic-Dental-...0-Pieces/64330
Sorry it was 10 years ago and I cannot recall. I think it might have been listed as "kitchen stuff" explicitly to avoid complications..... Where the packers told me there was stuff I could not take, I packed those boxes myself and gave them generic labels - the shipping co were not that fussed.
I've never seen popcorn seasoning salt in Hong Kong.
My friends always tell me to buy Walkers Sensations crisps for them when i go UK. i guess those can't be found in HK?
I've seen Walkers Sensations a few times. I think at Great. Pricey as heck though.