Oh brother...
They are TEST SRAM chips. They will NEVER be packaged, they will NEVER be sold! There only purpose in life is to validate the manufacturing process all across the wafer. You get a LOT more information on an SRAM than you ever could on a CPU just due to the different way they work (not to mention transistor density).
Once that wafer has been fabricated and it has gone through sort (and just for the record, the wafers are sorted whole. They are tested again after the go through die prep and assembly, but only the good die get packaged and they don't package stuff that doesn't need to be packed, like validation SRAM!), it is pretty much so much silicon scrap. The only reason they would do anything else with that wafer is if they needed to look as some particular transistors to find out why they didn't work correctly and then it would go to failure analysis for more in-depth investigation.