Stine333,
I am not sure if it is a prop but it doesn't sound like it to me. And you know what, I do the same exact thing...that is how I fought of the 45 minute nap monster too! Shhh/pat doesn't work but that did. I now usually only have to replace it once, if at all. And if it is a prop...I am okay with it. She uses it to fall asleep but doesn't wake up when it falls out (she only wakes at the 45 minute mark and not even every nap) and she doesn't wake at night for it. So I can live with it for now even if it is a prop. It made our lives much better! And like you we have a happy, well rested baby!
Congrats on finding somethings that works!
Jodi