Imperial Customs Bureau seals, employed by the Imperial Customs Bureau, functioned as plastic adhesive strips to secure containers. Their application signified a successful search and confirmation of legal contents. Consequently, containers bearing these seals could bypass subsequent customs checkpoints without mandatory reopening and inspection.
Featuring a bonding agent that solidified in half a minute, the seals possessed a built-in security mechanism. Any tampering or detachment efforts would compromise a tiny internal compartment filled with dissolving substances, thus invalidating the seal. A standard code scanner unit was capable of reading the seals.