Several years ago, my Swiss army knife went missing from checked luggage. When I mentioned it on social media, loads of people described things that went missing from their checked luggage. In this article, this woman not only found several items missing but things not belonging to her were added.
When my knife went missing, I contacted the transportation authority to say what had happened -- because I was concerned if something can be removed, something can be added to your luggage. Something I consider a security and safety risk.
Years ago a woman travelled from Melbourne Australia to Thailand. A luggage handler in Melbourne added a bag of dope into her luggage which a partner in Sydney was supposed to remove. He missed it. Thailand has zero tolerance for drugs -- and locked her up with a life sentence. They didn't care how it got into her luggage.
If people write this CBC reporter with their concerns about things being added or removed from luggage, maybe this topic will get the attention I think it deserves. Someday, it could be an explosive.
https://www.cbc.ca/news/canada/newfoundland-labrador/air-canada-mystery-baggage-1.7592756