Im looking for help I.D.ing my corys. I have had them for 2-3 months and they are at a size of about 20mm so im pretty sure they are nano corys (the label when I bought them said corydoras pygmaeus). I thought they were a variant of habrosus but I am not sure. The guy at the shop says the pictures look like corydoras nanus but they would be a lot larger if that were them. What do you guys think?
Thanks in advance!

Here is another one I just grabbed with my phone to show the markings:
