After viewing the photos from this unit, it is fairly mild from a hoarding standpoint compared to many I've seen.
Based on the unit walks I've done during due diligence efforts, I believe there are major hoarders in every apartment community that doesn't explicitly train their maintenance staff to look out for these and walk each unit every 3-6 months.
Massive clutter doesn't always equate to bedbugs, but it makes it just about impossible to find them once infestation occurs. They can hid in the corrugation of a piece of cardboard and many other
very small
places.
The biggest risk with hoarders is fire. They should be dealt with immediately on discovery.
Here's a photo from an inspection I did in December 2010. Our bedbug dog alerted in the living room and the bedroom in this unit.
Ben Hestir