Dimple on the bottom

Picture of seeds, showing the little black speck on side. May be these are just various stages of maturity and the mature seeds are supposed to be black, but I have never seen black tomato seeds.

It is impossible to identify the tomato because there are so many different commercial red medium fruits out there. Since it just said "Tomato" on the description, most likely it is a hybrid bred for greenhouse production, early pick and/or shipping hardiness. As for the seeds, since there is all manner of ripening techniques and speeds associated with commercial production, the variation in colors is not surprising. You did not mention why you were interested in learning it's identity. If you liked it, save the seeds and plant out next year, with low expectations of the results. If it is a hybrid, you probably won't get anything like the parent, and germination rates for manipulated ripened tomatoes is going to be low.

Agree. We get at least 1 "ID this tomato" request per week and the answer is always the same. It is not possible to do. Even holding the tomato in hand and eating it would still be impossible. DNA testing might narrow it down to 50 possibilities, maybe.

slightly flat, average size being 2.5-3" diameter to 1.5-2" height. Bottom of the tomato has a slight central depression. The tomatoes are very meaty, sweet, and do not have many seeds. The seeds seem to have a small black spot near the pointy end

That describes over a thousand varieties if not more. The fruit was harvested immature for shipping so the seeds are likely not mature and may have been damaged by the artificial ripening process used.

Dave