Asheton, an original member of The Stooges, was found dead at the age of 60 in his house early Tuesday morning.
Officials are awaiting the results of an autopsy and toxicology tests before declaring the cause of his death. Investigators have said, however, they do not suspect foul play.
The Ann Arbor (Mich.) News said the musician's family changed the locks and hired private security to watch Asheton's house after people, including Asheton's former personal assistant, were found removing guitars from it Tuesday afternoon.
Police told the newspaper they returned the guitars to Asheton's family until rightful ownership is determined.