I'm thinking of keeping airpods I found in school
Where did you find them?
I found it on my classroom desk.
Even if you found them on your desk, you shouldn't keep them because they aren't yours. You should turn them in to the lost and found, if your school has one, or to the teacher. Or, if you know who they belong to, you could return them to that person directly.
I remember it being on my desk. I don't know whose it is and if it'll be hard to get back to them.
Well if they do not belong to you, you should try to find the owner or turn them in to the teacher. I bet the person who lost them really wants to get them back.