Ok ! The lady on the phone who told you is really straight forward so basically anything that look like firearm will get seized by custom.
My honest answer is I wouldn't bother to bring them back, sell it to your friend or give out to them. It's really not worst to bring them.
Yes, you can be honest by bringing them and declare to custom, maybe they are kind enough let you pass when they saw you as an innocent girl in their eyes, the worst is they just seized it. That's all.