How to tell an LEA “That’s not my job” professionally?

There’s a lot of important context to this story so please bear with me. I’m a first year special education teacher at a charter school in its early years. Most of the year, I’ve been the only special education teacher in the building (5th-7th with 19 students) for various reasons. I onboarded with 9 on my caseload (all 7th grade) and last month, 5th grade was added to my caseload (4). Last month we had a veteran special education teacher onboard for 6th grade, but for some reason he doesn’t have an email and isn’t set up in the system so his kids are still technically on my caseload although he is the case manager. I only have classes with the 7th graders, but I’ve made time (during my planning and such) to sit in on classes with the other grades since I knew they didn’t have anyone in their classrooms.

It’s the end of the year so I have progress monitoring for the whole school due, but it just feels like that’s not my job for his kids (the 6th graders). On top of that, the LEA is asking me for observation notes for an RDR she did for one of the 6th graders, which they apparently met for 2 months ago and she just hasn’t finalized.

I’m 100% sure the observation notes aren’t my job and 50% sure the progress monitoring for the 6th graders aren’t my job. How do I professionally say “I don’t have classes with these kids and I’m not responsible for their paperwork because they aren’t meant to be on my caseload AND there is someone with more experience in the building assigned to them?”