I remember dropping my bag at a luggage store at the big train station in Mumbai. Bags needed to be scanned before being stored, not uncommon. Except the scanner was on the other side of the station.
So I was sent off and queued up to get my bag scanned and more importantly get my receipt stamped to say it'd been scanned walked back through the crowds where I could have done anything with the bag - to the luggage drop where the attendant checked that I had the correct stamps to say it had been checked! No seals on the bag, nothing to stop me giving them a different bag, just the essential stamp on a bit of paper!