I could be wrong but the pos blocks should have your wallet address, mined pow coins will have a random address. I have mined 2 blocks using the wallet both had a random address and both for 5 coins when I checked on the block explorer they both show as new coins. I got another mined tonight but this time for 5.00004 with my address so I checked block explorer again and this one was pos.

Those 2 mined blocks were in the last 24 hours using an i5 3470, maybe not likely to happen but it does.