From my experience with these cartridges, sometimes when one cart isn't being recognized it will cause others to not be as well. You took the correct diagnostic steps to verify each cartridge is not being recognized separately, this will make my job easier!
Can you please do one thing for me before I send out new chips, with the 2 cartridges in question (LM & Y) when the printer is giving you the not recognized error on the screen, push each cartridge one at a time in and out or up and down to see if you can get either one to recognize. Sometimes these cartridges don't seat exactly for the chip read sensor to make a good enough contact, and if this is the case, then there is a very simply fix. You can apply a layer (or 2) of masking tape to the top of the cartridge where it is held in the printer (if when pressed in the cartridge is recognized) OR the same application to either the top or bottom of the cartridge if when pushed up or down the cartridge is recognized.
Let me know you findings and if this doesn't solve you concerns then I will get you replacements in the mail asap.