All hardware appears to be present and factory sealed.
Pamex GC5900BFAL Adjustable Surface Mount Door Closer Aluminum Finish
Model: GC5900BFAL. Closer Type: Surface Mounted Door Closer. Spring Size: Adjustable Power Size 1–6. Finish: Aluminum (AL). Backcheck: Adjustable (Standard). Material: Cast Aluminum. Hold Open: No.