Yes, I tracked the parcel and it was received and signed "RMREALY" (not sure what that stands for).
However, I have seen (in other threads) there were cases where UKVI have misplaced documents and didn't process it, and in the end UKVI sends a letter saying that their application has been cancelled as they did not receive the supporting documents in time.
I've also read other people having their documents redirected by the post to a different address, kept in the depot and destroyed after 4 months. Wouldnt want to be in such situation!
Therefore, I was expecting a letter to confirm recept of documents as I thought that's standard procedure. Didnt know that some might not even get sent this letter