Who do I contact about lost / abandoned property that's considered treasure-trove?
106961
the county assessers office
788057
They have some of those on display at the Smithsonian Museum of American History.  Maybe if you send them an e-mail they can tell you what they have theirs insured for (not likely).  Or put it on Ebay with a high reserve, and see if you get any good bids without selling it.
626254
I think you should take them to an auction house and get them valued, film collators and movies buffs will fight over something like that if they are in good condition.
338458
ebay\n\nand.....\n\nBowling alleys can tell you when they will have old balls they will discard...maybe they will give them to you for free.
918228
If you are talking about finding one that is filed you would contact the property appraisers office either on line or in person. This is public record and should be pretty easy to find. You can use the physical or legal address of the property.
163444
Contact a good realtor in the area, they have software databases that can pull up any address and tell you who has listed it within the past few years.
173430
If it is of some historical significance you may find something at the historical society, otherwise you are probably out of luck.  You might check at your local city or county building department if there were any recent remodeling or renovations to the house, they may have something close to blueprints.
443335
this treasure hunters site has a couple of mentions in\nits various forums.
761874
Try FSBO's, or expired listings
649810
check the tax records for the county the property is in this should reveal the owners name.then its up to you to track them down.this is usually there full legal name so it is helpful.then contact your attorney and have him find them for you.
853418
Call the county sheriff and ask them.  It is not likely you will find a list of items other than those that are being offered for auction.  If there is an auction coming soon then they will have a list.  If not then you will have to wait.\n\nIf you are looking for something that has been confiscated then you must have a very good description of it and possibly a receipt of ownership.
768787
Contact "High Times" magazine, and place a classified ad in the back: \n\n"Never lose your stash again!...."  \n\nor\n\n"Can't find your stash?  We can help...."   \n\nand then leave your contact info.
542002
E-mail us ... we have a vast collection. Just remember that "rare" implies exactly that. You'll need to be more specific in your inquiries.
517897
Not sure... sometimes lost items are right in front of our noses....\n\nBut if you happen to find your marbles, please let me know so i can go there and look for some money that i just cant figure out where it went!!    :P
151887
Gaining access to something closed.
289448
if you want to know who owned the property, check with the municipality.  if you need a notarized copy attesting to that, the town should know who notarized the sale.  they might not have a copy but you can try and find if the notary is still in business and has the records
911508
Somebody knows that she has stuff over there that you can talk to somebody about getting that came from another place and was brought there by others and no one contacted you regarding unclaimed property that may belong to you left by friends or family or heirs because they lost your number.