If you see them during the day you are infested.   

I saw a roach infestation ruin the control panel on a dishwasher.

A lot of people assume a house has to be turn key but it doesn't it just has to meet all the VA requirements i.e. no foundation issues, no active infestations and the like.

We have a lot of units, and have had some pretty serious infestations.  

I texted the photo to the person who performed the two springtail treatments and he said it was not a bedbug and in fact based on being over there he did not think there was any kind of infestation (springtail or otherwise) in that house either.

Scavengers (people) were picking this disgusting garbage, so we used spray paint on the trash to prevent someone from buying brand new sewage infested baby swings off ebay. 

He also said two mattresses were left around the property and a former tenant was telling people the house is now infested with bed bugs.  

Im in contract to buy a cat infested condo.

Whatever you decided to get, do NOT forget to buy zippered mattress encasements to help prevent bedbug infestations.

However, if it has never been tested, you don't know for sure and do not have to claim that as a seller.If the seller DID have knowledge of it, whether that is through their own experience with the issue or a contractor informing them, they can be held liable and the buyer even has means to sue them for damages.If you are a seller, and whether it is a bug infestation, gas leak, foundation issue, etc, do the right thing and claim all of these on your seller property disclosure.