All his counterfeits that we know of were NEVADA or DIECAR molds.

This article, based on TCR 10, lists 58 and is missing a few we are certain of since then. I need to update it.
http://www.marlowcasinochips.com/links/davidspragg/borland/borlandhotstamp.htm

As I said, the boxes contain die impressions that he may not have ever used, but.....??????