If I leave it off, it only makes a $5 diff on fed refund if they ever finally issue one, no sweat.  
For CA, if I leave it off,  they would owe $137 more if a W2 ever does appear at some point.   

But If I file the CA return and include the paystub info with the sub W2, it will create a state withholding mismatch and the refund will be delayed since they don't have record of the state withholding...CA is a pain about matching up those withholdings!