I too tend to keep a lot of old notes, but I don’t want them to get out of sight. In your case, I think #archive plus object decoration to hide them would be a great combo. That said, I don’t keep receipts or such within my notes, they are maintained in different folder in different app.
As I said, I personally don’t delete much in my notes, I just get better at searching. The only ones I “hide” are my completed tasks. I do this by moving the completed todo items into a separate directory, but keep the folder structure. This works as I have a defined folder structure for todos with Backlog/<area> files for each “area”.
PS: Whenever I want to delete something or generally think I have an “inefficient note taking system”, I just console myself by saying, “all the state is in git and I can just write a bash script to get whatever I want if I really need it” and move on. So far, I never needed to do anything and life has been good. I’m glad my brain is gullible. 