This is a commissioned work, thanks to -✯『TheJoJoFan』✯- for the commission!

Ah yes, the briefcase of G-Man from Half-Life.

Well, it's actually an entry of the Sketchfab Texturing Challenge : Suitcase, or just the #SuitcaseChallenge in short, which you can see the original model from Santa Cruz Museum of Art and History, the low poly version of it, and the blank model for the challenge here:
https://sketchfab.com/3d-models/suitcase-90f9619a6ce44c949bd6df2b77cdcacd
https://sketchfab.com/3d-models/vintage-suitcase-derivative-4097027ee5e246579cf80a23aab1522c
https://sketchfab.com/3d-models/suitcasechallenge-texturing-challenge-model-c31368508079483b9cf0cb7a540b1329

But still, it's a fairly interesting take on the good old briefcase always wielded by G-Man.

Includes:
sketchfab\quaz30\g_man_briefcase\skf_g_man_briefcase.mdl

Credits :
quaz30 - Original creator of the model.
NeoLin - Porting to Source.
Fennecai - PBR to Source Converter