When it comes time to leave, (1) Will French Customs allow you out with all those little treasures? They may claim they are "currency" or decide to tax them in some manner; and (2) Will U.S. Customs let them into the country, without payment of Duty or some such?

I presume all is okay but it might not hurt to double-check with someone, maybe our Consulate, unless you are 100% positive old chips can go. Perhaps other members reading this, who have brought in international chips, know more!