I bought a late 2011 base MBP with discount + discounted Applecare in an Apple Store in June. Swapped for a mid 2012 base MBP 5 days later when they arrived but was told the Applecare discount wasn't available any longer so got a refund. Reading this thread later I wasn't surprised, if disappointed that the warranty didn't extend as per HE contract as I bought in store.
Anyway, today I got Applecare to make a phone exception and call me as the power adapter has failed. During the call (all sorted and received shipping notification of new part within an hour) they started trying to sell me Applecare. I said they didn't really want to start that conversation and was asked why. So to cut a long story short was told that store should have transferred Applecare to second machine, told them the serial number of the first machine and (despite having refunded the cost) they transferred the warranty onto my new MBP. Checked service status an hour later and now have warranty & phone till June 2015.
Very impressed yet again that Apple fixed their mistake in my favour.