12/05/13: The Washington Post reports UPS turned itself in. It intercepted a shipment to the Iranian Embassy in Helsinki from a customer in Sweden but then inadvertently released it for delivery in June — a probable violation of US sanctions on Iran. The contents of the illicit package: a harmless box of ink cartridges for a printer. A contrite UPS told US regulators it made no profit on the delivery and has beefed up procedures to prevent a repeat error. When it comes to US sanctions on Iran, no detail is too small to overlook these days. Since February, publicly traded companies have filed nearly 500 disclosure forms about their business ties to Iran. The disclosures included hotel bills, Costco memberships and a few dollars collected for ATM transaction fees. The recent six-month deal with Iran over its nuclear program holds out the promise of a modest relaxation of international sanctions, but there is no letup in the new requirement that companies whose stock trades on US exchanges keep track of even the tiniest interactions with the Islamic republic. And as Congress threatens to undercut the nuclear deal with even tougher sanctions, companies are scrambling to document virtually every Iranian encounter. Corporations can quickly rack up millions of dollars in fines if they violate trade sanctions, and the dollar amount can climb higher if the activity is not properly disclosed. Perhaps more alarming to firms are the reputational and legal risks they face if they fail to report the business ties, including potential lawsuits from disgruntled investors.