How will they know

Hey guys
So I was wondering about something
I’m an international student
Now my recommenders from school mentioned most of my ecas in their letters I’m guessing. Since I gave them a list. But there a some major ecas I had which my teachers nor counsellor ( she’s kind of the worst) doesn’t know about but I mentioned them in my apps.
One eca is mentioned by my optional recommender but the other isn’t. Although it does fit my profile I think since it’s related to research and I wanna major In that field. Will they think I lied ?

Likely not. Teachers are not expected to know about every EC in which their students participate. My daughter’s high school does keep an electronic record of the school-related ECs in which she is signed up for, but so many kids do so many activities outside of school, and none of those get captured. Be honest in all your apps, but don’t overly worry about things like this.