The people who built it were suspicious, the people who lived around it were suspicious and the shop keepers who supplied it with fresh food, milk, chocolates and Pepsi (because 'death to America' doesn't cover American junk food apparently) were also suspicious about the strange house and it's stranger inhabitants.
But the caretakers were free with money and that kept mouths closed.
Until the SEALs landed, blew a hole in the wall and filled the house with blood, bodies and bullets. Then they ransacked it and left. The ISI took over things from there, conducted further investigations in the house, which revealed nothing more than the usual - silence, fortifications, supplies and pretty much anything can be bought for enough money.
The Pakistanis kept the house under quarantine for a year. When it became obvious that nothing more could be learned from the place, they demolished it in February 2012, to prevent it from becoming a jihadist shrine.
Image: This combination of two photographs shows local residents gathering (top) outside a burnt compound at the hideout of slain Al-Qaeda leader Osama bin Laden in Abbottabad on May 4, 2011, and (lower), a local woman (L) walking past the same demolished compound of bin Laden in northern Abbottabad on April 25, 2012 ahead of the Osama's first death anniversary.