Not sure on the size but the squares on bottom of container were less than 1 cm squared.
I had a look at it through a magnifying glass and it had a y shape on the back of its head with spots/dashes along each side of its head. What appears to be shine on its back looked green. I am pretty sure this one had hairy palps (should have used a notebook)
Image has been cropped but I hope I have given enough Information for an i.d. please.