Happen to find a third pot that went missing and place it back on the stand? Next time you remember the incident with the keys, the pottery prop pulled out is the one involving 3 pots. So you clearly remember finding your keys between three plots.
Well what about the old memory? You pull up the memory of a memory, but each memory is generated with props and there is a chance you end up remembering your original memory had 3 pots as well.
The more trivial the detail, the more likely you'll only keep around the most recent prop only and thus have a false memory. There is a lot of psychological research into people watching cars driving where the psychologist then falsify memories of the vehicles (something that is never called out as being worth remembering at the start of the experiment). It works decently well in adults. It works horrifyingly well in kids.