39 CFR §501.9

1. (a)A demonstration or test postage evidencing system is any system that produces an image that replicates a postage indicium for which the Postal Service has not received payment for postage. The following procedures must be followed to implement controls over demonstration or test Postage Evidencing Systems:
   1. (1)A demonstration or test Postage Evidencing System may print only specimen or test indicia. A specimen or test indicia must clearly indicate that the indicia does not represent valid postage.
   2. (2)A demonstration or test Postage Evidencing System must be recorded as such on internal provider inventory records and must be tracked by model number, serial number, and physical location.
   3. (3)A demonstration or test Postage Evidencing System must remain under the provider's direct control. A demonstration or test Postage Evidencing System may not be left in the possession of a customer under any circumstance.
2. (b)All indicia printed by a demonstration or test Postage Evidencing System must be collected and destroyed daily.