The jewelry store owner Sofia tells TMZ, "When we loan out jewelry, we have a whole procedure that needs to be done. There is paperwork that needs to be filled out and there needs to be insurance information given or credit card information in case something happens with the jewelry."
We're told the paperwork entails an itemized list of what the customer is borrowing, a signed contract claiming responsibility for the item while it's out of the store, and credit card and insurance information in case anything goes wrong.
According to Sofia, the store RARELY deals directly with celebs -- "The stylist will come in and ask to borrow the jewelry for a shoot or an event."
Sofia wouldn't comment on the Lindsay situation -- but the surveillance tape could be the smoking gun here if it shows Lindsay signing any paperwork ... or not.