I don't think it is an older RS3M, as I have (I think) every cube in that series, and it doesn't match the MF3, MF3S, MF3RS, MF3RS2, RS3, RS3M, and RS3M 2020. I suppose there is always a chance that one of those could be wrong too, but I think they matched the pictures on the boxes.
Unfortunately I'm not very familiar with all of MoYu's line. If the logo on the cube is exactly the same then I would guess it's one of the MF3RS series as their WRM ones usually have different logo. But other than that, I have no idea.