Gamblers fallacy. If you flip a coin you have a 50% chance of heads and a 50% chance of tails. If you get heads, and then flip it again, you still have a 50% chance to get heads and a 50% chance to get tails.

Each time you opened a crate, you had the SAME chance to get the items you want as the previous one. Opening more crates just gives you more chances, not better chances.