I found a great way to send cards to Canada....get a nice big envelope 10x12 for shipping paper docs. Get 2 card board pieces slightly smaller than the envelope. Put as 1 or as many cards you are shipping on the cardboard a tape securely. take the other cardboard and place over first one and slide into envelope. Declare paper docs. and value it at $15. I have done it 7-10 times with no problem and took around 2 weeks to arrive to destination.
You should be fine, they are probably trying to figure out a correct value if you put down baseball card. And would make sense if you placed the value very low.
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