Got to give it a go, anyway if they open up the case they will see what it is. Reminds me of years ago when i went to corfu. i had a case that was so stuffed full I couldnt close it, after hubby struggling with it for half an hour we eventually got the zip done up. In the case was a big box full of tablets, paracetamol, anti sickness,you name it we had it in the box. Well after we checked in it must of gome through a scanner and looked suspicious because when we got to Corfu and picked up our cases, ours was on the conveyer belt with the zip undone

they must of checked it and not been able to do it up again
