I went to the PO today and had two books to mail, one label printed 1st class and printed media mail.  I had delivery confirmation on both.  When I pull up my custom DC page here, it only shows one of the two that I mailed.  Does anyone know why that is?  Why wouldn't it show both? I paid for both.  Thanks, Jen

If your PO didn't scan the DC on both, both won't show!  It only gets into the system once it is scanned by your PO or once it is scanned en route to it's destination. 

Did you use Custom DC on both? A book mailed through the PBS system would not show up in the Custom DC, but would show up on the details of your books mailed.

I think I had one package sent using custom DC not show up for a few hours after I printed it.

If you paid for them, you can check your money activity and confirm that two DCs were actually paid for.

Media mail is sent on a space available basis. So if that's the one that hasn't scanned yet-it could be that they just haven't gotten to it yet.  It was most likely put aside as a low priority because it's MM.