Yes, that's what I did - rang my vet - who told me those symptoms. But then you can hear one thing from one vet, and one thing from another, so as you say, it is best to make your own decisions based on the evidence you find.
Having said that, it is also a common suggestion to put down aluminium foil where you don't want cats to go, because they don't like to walk on it, which seems to contradict keeping them away from it entirely. So there are definitely two schools of thought on whether or not it is bad for your cats.
I don't want to take the risk with mine, but if you feel happy that your kitties are safe and not going to ingest any, then they probably are safe and it's no problem. My girls aren't really into chasing scrunched up balls of anything
, anyway! Sunday's too lazy and ever since Sashka discovered hair elastics nothing else has held any interest for her..