Won't work, it's stainless steel.
Otherwise, I agree with
@AndBreathe . A very small needle is very hard to find so it can be anywhere.
Personally, I'd likely be feeling frantically all over my injection place, pushing and kneading from all directions to see if I could feel anything, and if I didn't, I would assume it had dropped somewhere.
But the advice I'd give someone else is to contact your doctor/nurse or 111 for advice on if this is worth an x-ray or not.
Good luck, and let us know how this stupid diabetes adventure ends,
@Wurst !