Question to Nurses and Phlebotomists?

This is to everybody who is experienced in drawing blood especially with vacutainer needles. If the needle was opened and then recapped (ie the seal broken) would it be easily identified by the nurse that this needle has been used because of the broken seal or it is not that obvious and it can be missed. I am asking because I had a blood draw using this vacutainer and since they dont come wrapped I am paranoid that the nurse might have mistakengly used a previously used needle on me.