Keep in mind that I am a hobbyist so my species IDing is OJT, not schooled and limited to what I have regular exposure to examine (and usually have kept).
The eye, mantle and arm proportions suggest a dwarf of some species (particularly eye to mantle). The charcoal gray color is altogether new to me for any species and I wonder if it is some kind of artifact of the camera or lighting (but everything else looks correctly colored). If you Google search Octopus mercatoris and look at the photos (then ignore anything that is not red because all manner of octopuses will show up) you will see the similarities in the eyes (including what appear to be diagnostic tabs under the eye), ratios and patterning and the extreme in color difference.
Can you ask them where these were collected?
The eye, mantle and arm proportions suggest a dwarf of some species (particularly eye to mantle). The charcoal gray color is altogether new to me for any species and I wonder if it is some kind of artifact of the camera or lighting (but everything else looks correctly colored). If you Google search Octopus mercatoris and look at the photos (then ignore anything that is not red because all manner of octopuses will show up) you will see the similarities in the eyes (including what appear to be diagnostic tabs under the eye), ratios and patterning and the extreme in color difference.
Can you ask them where these were collected?