Because they never sent them with Purolator. "No tracking number" is basically to conceal this fact. Today they told me they used Canada post(previously they said it was purolator)I just hang up a call with IRCC and requested any tracking number for Purolator to follow up with them about my RTD, they said we couldn't provide you this because it's not available. I don't understand how they sent an important documents without any tracking number. it's ridiculous.