checking if paper tax return received

My circumsatnces mean I have to send a paper tax return. Sent my paper tax return mid October. foolishly did not send recorded delivery. how do I check if HMRC has received it, since it is end of November and nothing has appeared on my Gateway yet

Hi,
As we are unable to access records on this forum, you will need to contact our Self Assessment team for advice.
Self Assessment: general enquiries
Thank you.