Yes — the Collector Set (model 2874172CS) does include both the Walther-branded folding knife and a holster.
What’s included in the Walther P99 Final Edition Collector Set (2874172CS):
P99 Final Edition pistol
OWB holster
Walther-branded folding knife (with sheath)
Hard case
Commemorative coin
Magazines (typically 2x 15-round)

Yes, the Walther P99 Final Edition Collector Set (Model: 2874172CS) specifically includes the Walther-branded folding knife and the holster, along with a commemorative coin and a hard case.
This "CS" (Collector Set) version ensures you receive the complete package, distinguishing it from the standard Final Edition models that may only include the pistol and coin.
Key Included Items in 2874172CS:
Walther P99 AS Final Edition Pistol (OD Green Frame, 9mm, 4" barrel)
Walther Marking Folding Knife (with sheath)
P99 Final Edition Holster (Hybrid IWB/OWB)
Commemorative Collector Coin
Commemorative Weatherproof Hard Case
Two 15-round magazines

Hi Dong and welcome. Yes Sir,the Walther P99 Final Edition Collector Set (2874172CS) does indeed include the Walther marking folding knife and theOWB holster. Picture of exact case contents here: galleryofguns.com/genie/default.aspx?item=2874172CS --------- Cheers, stay safe and enjoy!