Here is an example of a status request via Deep Link for a shipment with the number A001EAB020000002AA97, which was posted on January 30, 2018:

https://www.deutschepost.de/sendung/simpleQueryResult.html?form.sendungsnummer=
A001EAB020000002AA97&form.einlieferungsdatum_tag=30&form.einlieferungsdatum_
monat=01
&form.einlieferungsdatum_jahr=2018