We traveled by plane a couple years ago and had 500+ pins in our carry on luggage. As it has already been said, don't put your pins in your checked luggage.
As we passed through security it took us about 5 extra minutes, they seen all the metal and after asking what was in the bags, took the time to do a bit better check. Our pins are in zipped cases, so to save time and make it easier, leaving the bags unzipped helped.
The return trip from Orlando was simple... they just looked at us and said "PINS?" lol. They see them very often.