@Flipper the Priest The First "Loot box" type product i can think off. It doesn't help being past a certain age either, because when we were at school you could swap some with other collectors. In fact i am that old, i remember football cards and chewing gum.
Ιn my hood and my school we had two gambling variations of Panini football stickers and they were played with decks of stickers , by collections of duplicates,triples,etc...Both games were played with sticker numbers in the back.
Of course we used to trade too.
The first game, i can't recall the name, 2 or more players were throwing stickers with their backs, from zero, if your last digit did match the previous one you were winning the turn and were collecting the pile that was formed.
Example if the player A threw a No18 and you threw a No23, player 1 throws again. Until for example , player A threw a No 48 and you then trow a No 108. Then you win and you collect the threw stickers in the pile.
Second game was more casino-like. It was named blocks. One friend with a big deck was doing the dealer and after shufling his deck, you should cut it in 2 or 4 or more blocks, depending on betting players and the size of the deck. You put the blocks with player images facing upside. Players 2 or more...Each players places his bet, the bet was a number of cards pretedetermined before the turn starts. IE i place 3 stickers on on block A and my friend must place 3 cards on block A or B , or C, D, E, etc, depending on their number. We turn the blocks of stickers backwards and whoever finds the biggest number wins, IE if i had No 205 and my friend No 75, i win...
Not so childish game now that i remember!!!!

Bring me a kid that spends 1,000 bucks of his mom's credit card on FuT/MyClub, to tell him thug-life gambling stories!!!
I remember in school time breaks, whoever was caught to play gambling with Panini, the penalty was too strickt. You should go to principal's office and your stickers deck was seized by the principal in a specific drawer of his desk. Your parents could claim your stickers after the school year's end.