Bioprofessor is right about the court action and the advertising requirements.
The storage place must notify the owner that they are past due, and that they intend to auction off the items. Depending on the state, there may not NEED to be a court filing (there is none here in RI). The advertising requirements are almost always universal, however.
Check your local newspaper's "legal" section, where they advertise foreclosures, and bids for the state, etc... Your best bet is to go talk to some of the companies themselves and see if you can find an "in". My experience in both attending and conducting auctions (I'm an attorney) is that the more people from the "public" show up, the less likely you are to get a good deal.
steve