Don't think that reference that a CE engine with an A suffix has been recycled (ie second time around) is correct. I've seen A, B and C suffixes on CE engine stamps. In the case of Flint built CE small block engines that would be 30,000 CE engines (or bare block, fitted block or complete engines), 30000 CEA engines, 30000 CEBs and then some number of CEC engines (assuming no CED engines exist), Thats at least 90,000 small blocks which is one heck of alot of replacement engines, or engine assemblies.
I believe (my theory) that the A, B and C suffixes indicate the type of components that made up the replacement. A CE number indicates a complete engine, or perhaps a short block. CEA is a fitted block (block, pistons rings and rods, but no crank or cam), CEB is a block only, CEC ?? Always looking to be educated though. Bring on the documentation.