Which form is associated with reporting suspicious transactions?

The correct choice for reporting suspicious transactions is PS Form 8105-B. This specific form is designed for documenting and reporting unusual or suspicious activities that may indicate fraudulent behavior or violations of postal regulations. It's essential for maintaining the integrity and security of postal services, and it helps ensure that potential criminal activities are reported to the appropriate authorities for further investigation.

Using the right form, such as the PS Form 8105-B, is critical as it contains specific fields and instructions tailored to facilitate accurate reporting, ensuring that all necessary details are captured properly. This form contributes to a systematic approach to identifying and addressing risks within postal operations. The other forms listed serve different purposes, such as tracking or notifying about specific postal services, and therefore are not applicable for reporting suspicious transactions.