You can leave a review on MM if you inquired through MM's messaging system about that specific animal, otherwise you can't even if you bought an animal that was listed.
I don't list some animals on MM that I have available. One reason for that it wouldn't be cost effective to ship them, which is probably the case here; SYR's biggest box from me to LA is $225. Other reasons are that the listings there for the species/morph are saturated and I don't want to give them away; they're low dollar animals that aren't worth the trouble to list and are easier to sell locally; they have a visual imperfection that doesn't make them less of a good pet but does prevent them from meeting MM's listing standards. I also don't list anything in the winter, because Wisconsin.![]()