Using the same chips at both locations was very common for Harrah's, until gaming put the kibash on it. A lot of shared chips had no location on them, like the brass cores.

Here's a link to a $2.50 with no location.
http://www.greatbasin.net/~sweetie/harrahs250bc_n5132.jpg

Here's one made for Tahoe after the rules went into effect.
http://www.greatbasin.net/~sweetie/harrahs250bc_N6470.jpg