Yes that is POS, I'm guessing around 200 to 210 cash for each of those
It only takes 25 confirms for the stake to be released so its easy to miss it.
Easiest way to see which coins the POS came from is to turn on coin control.
Do this by going to settings,  options, Display and check the box that says display coin control.

Once you have done that, click on send coins and in the window that opens up click on inputs.
From here you can see the ages of all your coins, look for the newest coins and you will find 2 for each POS you minted.
What happens it splits the group of coins in 2 and adds the interest to one and resets the coin age to zero.

I originally had heaps of coins in groups of 10s and 20s which only gives a fraction of a coin each time it stakes.

What I do now at the end of each day is send all the coins that have staked that day to myself along with any new coins I've mined to make it one larger group.
This costs me 0.001 ir 0.002 cash to do, but it means rather than heaps of little stakes I now get fewer back of larger amounts of coins when POS happens