There are a number of electronic seals on the market that employ radio frequency identification tags to alert a business that a container has been sealed, and if it is breached. Here is an article that explains the types of seals available: Types of Supply Chain Seals.
You can also purchase our article, RFID-Enabled Electronic Seals, to view a list of available models.
Here are some other articles that might also prove helpful:
—Mark Roberti, Founder and Editor, RFID Journal
Where Can I Find a Directory of RFID Companies? »