I have smelled both sewage and decomposition, and my sense of smell isn't the best but God damn how do you confuse one for the other? They smell nothing alike!
No, nothing alike, but the employee likely shit and piss themselves and that was the smell. Not sure a corpse is decomposing much in only 4 days, especially in a climate controlled office.
In 4 days there shouldn't beuch decomposing, but since there was a smell I don't think it was air cooled.
I also can agree with the other commentor. Decomposing and bad plumbing are a hell of a difference. I have no fucking clue how you can mismatch those two, but I guess the employees havent smelled decomposing before.
Sorry I'm late to the party, but you definitely smell a corpse after 4 days. I used to bag and tag bodies for a while. Just breathe through your mouth.