This is a hard drive or SSD carriage for the Datto S3X1 (SSDX) mini pc.
The chassis requires two M2 screws to secure the carriage. You'll also need 4 hard drive screws that have a tapered (countersink) head (this is a requirement as there are very tight tolerances on either side of the hard drive and there is NO space for screw heads.
The author hasn't provided the model origin yet.