tamper-evident
adjective uk/ˈtæm.pərˌev.ɪ.dənt/ us/ˈtæm.pɚˌev.ɪ.dənt/
（包装）防窃启的
If a container, etc. is tamper-evident, it is designed to make it obvious if anyone has touched its contents.
Our range of tamper-evident envelopes are ideal when extra security is required. 在需要额外安全措施时，我们的一系列防窃启信封是您理想的选择。