The UNMIK/Kosovo Post organization created cacheted envelopes for almost all stamp issues and provided special (usually pictorial) cancellation/postmark devices marking each first day. The list below is for these official FDCs. If and when unofficial covers cancelled on the first day of issue are available, they are listed in the Covers & Postal History page).
The Kosovo Post announced quantities of some FDCs that it issued. It is unclear if the statistics refer only to the envelopes with the official cachets printed on them or fully prepared FDCs with stamps affixed and cancelled with the FD postmark.