Generally speaking, those with flash cards are genuine. The official symbol is cardboard. I think plastic is better.
I have bought both plastic packaging and non-plastic packaging. It's uncomfortable to play with plastic packaging, and the game of Three Kingdoms Killing is popular in recent years, and you don't want to carry on the family line in the future (just kidding ~). So it's not necessary. I bought mine for half a year without plastic packaging, and I have been playing with it. Everything is fine except that one of them fell into the water and peeled off a little. Just pay attention when playing.