Can a puzzle with missing pieces be considered complete?

After deciding that she has a bad shopping habit, a friend of mine challenged herself to not purchase any new items in 2026. Now she is only shopping yard sales and charity stores. She is focusing more on offline hobbies so it sort of fits.

This brings us to the puzzle. She got a super 80s looking 1000 piece puzzle with a pictures of two white tigers on it at a charity store. After working on it off and on for a few weeks she discovered that it is missing 3 pieces.

She found an old frame for it and hung it up anyway. She says it is complete because that's how it came to her. Is it really complete or is it simply an incomplete puzzle on the wall? Or both somehow?

Edit: Just to be clear, we are not having an argument about this. We both found the topic interesting to discuss and couldn't really decide on any single answer.