BRP lost during french visa application

I am currently a university student in the UK who is about to go for a ski trip in France. I am from Thailand so I need a student visa and I had a BRP card to go with it. Furthermore, to go on this ski trip I need to apply for a Schengen visa which require me to hand in my passport, my BRP card along with other documents.

I did this with the TLS contact group in London. Process went smoothly and the application was successful with my passport being posted back to my university.

Problem is, my BRP card is missing, it is nowhere to be found. Is this normal? I need the BRP card to return back to the UK after leaving here for France, which means I can't go on the trip without it. What should I do?

Thank you very much

No need for multiple posts.