Thanks to Connecticut Electric (CE) for paying for the UL Classified testing of Siemens QP line you can use a
full size standard QP (No GFCI / AFCI / GFPE) as a Classified any of the following list of panelboards.
No additional mark or stamp is required on the QP Breaker to use it as a Classified, you just need one still sealed in the Connecticut Electric packaging.
See photo in post 27
As soon as you open the package there is no way to tell the Siemens breaker from any other.
Note also the absence of HOM