1. This is the tracking I got for your:
Tracking No. :RB116494496SG
Date / Time : 2016/11/23 - 16:05
Description :Tracking is not available for international registered mail items sent to Canada.
Service Type :International Inbound Registered

2. This is another one:
Tracking No. :RB117577736SG
Date / Time : 2016/11/28 - 11:37
Description :Tracking is not available for international registered mail items sent to Canada.
Service Type :International Inbound Registered

3. And the final one:
Tracking No. :RH351440146CN
Date / Time : 2016/11/11 - 04:15
Description :Tracking is not available for international registered mail items sent to Canada.
Service Type :International Inbound Registered

4. Here is a tracking of all your parcel:
Number: RB116494496SG
Package Status: In Transit

Destination Country: Canada

Origin Country: Singapore
2016-11-23 16:05 Despatched to overseas (Country code: CA)
2016-11-21 16:05 Received from Customer
======================================
Number: RB117577736SG
Package Status: In Transit

Destination Country: Canada

Origin Country: Singapore
2016-11-28 11:37 Despatched to overseas (Country code: CA)
2016-11-26 11:37 Received from Customer
======================================
Number: RH351440146CN
Package Status: In Transit

Destination Country: Canada

Origin Country: China
2016-11-13 11:05 Shanghai Pudong, left
2016-11-13 11:05 Shanghai Pudong, left hand navigation
2016-11-13 10:06 Shanghai Pudong, reach
2016-11-10 23:52 Shanghai Exchange Bureau, have been exported directly
2016-11-10 22:02 Shanghai Exchange Bureau, have been exported to open
2016-11-09 22:05 Canton international parcel, left, next stop "wide-large"
2016-11-09 19:17 Canton international small packet, sealing
2016-11-09 19:17 Canton international parcel has been accepted
======================================
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5. Parcel to Canada can take between 4 to 8 weeks to be deliver. I suspect that all your parcel has arrive in Canada. Possibly they all landed in Vancouver Inbound Warehouse.

6. Now what needs to happen is that Canada Post scan your parcel and give it to the Canadian Customs for clearance, then back to Canada Post for delivery.

7. I also suspect that Canada Customs is indicating when they can have more parcels to inspect to Canada Post so that why the parcels are not scan on arrival in Canada.

Thanks.