"Calm down, we just want to talk to you". Tessirda announced, the friendly face to Amunyet's mailed fist. "Really, you being here might be fortunate. You might clear up a few questions we've got about this place".
"A'ight, A'ight." says the drunk, "Jus' don' cut me!"
Assuming you take 20 on Perception:
Kelne finds the apartment mostly intact. Anything of value appears to have been taken, but the place is not ransacked. There is no blood, or any other indication of a struggle.
Tessirda looked the man up and down, and shook her head. "We won't hurt you unless you make us. Now, how long have you been here?" A sensible enough questions - and if the answer was more than one night, a really damning peace of evidence.