回复：10万元的货被加拿大海关扣了,说要检验真假怎么办?急在线等

Just pay for the GST and duty according to the real value of the item, you will be fine.
Underdeclared value is done via sender, not via you, so you should be fine.
Show them the invoice between sender and you, then pay for the tax.

Don't be too greedy next time on this.