I am glad my impromptu query has led to shedding light for a bunch more folks waiting up here. It does seem that a pattern has emerged that the SSL's are the only ones with known VINs so far. On the other hand, what we have in the last two days is just a snapshot at one moment.
We know from GeorgeB's generous communications that Candian production only began in the last couple weeks. It seems plausible that only small percentage of production slots have been reserved for Canada cars. They still have so many supply and logistics challenges to address that it was probably unrealistic to assume that all Canadian Signatures would be produced in one continuous undiluted block.