Put the body in the refrigerator — it keeps about two days.
Literal
Corpse [object-を] refrigerator [in-に] put about 2-days [copula-です].
A chilling, clinical sentence — reads like a forensic or medical professional speaking. 死体 ('corpse, dead body') is direct and technical. The final ~くらいです ('about X, around X') attaches to the duration 2日 to give an approximate time. The topic-dropping makes it read almost like a procedural instruction.