New Sim Card

I just received 2 sim cards in the mail from Videotron.  I have no idea why they arrived in the mail.  There's no letter or anything with them, just 2 sim cards in an envelope.  Why did I receive 2 SIM cards in the mail?  I assume there's 2 because we have 2 phones, just not sure why they sent them since there's no problem with our phones.  Thanks for any help!