My dad found out about security seals

My dad used to had a hard time sending packages because he is not very trusting. If you knew my dad you would agree with me. He distrust strangers and you have to gain his trust first before you would be able to talk to him openly. I remember one time when he was talking over the phone with his friend. I don’t know what they were talking about but as soon as they were done. He immediately turned the computer on. I asked him what he was looking for because he seemed so focused. He told me about security seals that his friend told him about. He said it was effective in package tamper detection and security purposes. It seems that my dad is really interested so I left him with what he was doing and went to my room. The next day he told us all about security seals.