Jay,

There are always going to be exceptions. There are chips that have been obsolete (according to my definition) that have later become current. Which would fit your LE example. Another example would be the Harrah's Lake Tahoe $1 PMSC chips that were retired and then put in use in the Harrah's Reno casino. In Nevada, it is possible to get obsolete chips from the cage, if a customer has turned them in. I would still consider such a chip to be obsolete.