Well... I have some good news to report. After I called the seller once again today and left a somewhat impassoined voicemail, he finally contacted me by text and asked if I'd like to return the lens or if I'd like to get a partial refund. I gave it much more thought, especially after I had a week to use the lens and consider all the useful input here. Not that this helps the issue with the lens, but I passed said lens around to all my friends and none of them were able to see any scratches. (Granted this was done somewhat dim lighting akin to where I inspected the lens at Starbucks when the seller originally sold it to me.) With that and reading various articles on scratched and damaged lenses - including the one Rolleiflexible sent (thanks for that!) - I grew a bit more comfortable with the lens. These scratches are superficial and, after gently cleaning the lens with a super soft cleaning cloth and 1-part rubbing alcohol to 20-parts distilled water, I can't feel any scratches with my fingernails.
Anyway, since the lens is in otherwise flawless condition and comes with the original box, paperwork, and lens storage container (mind you this is the newer 1999 edition which I
never see sold with the original paperwork, box, etc. on eBay, thus making it a bit more valuable), I decided to ask for a partial refund of $85. A few hours later, the seller Venmoed me the $85 and that was it! So basically I got this whole set for $100. I'll use this refund towards another lens or, as I've taken many lenses apart to clean, I know I can disassemble this lens, purchase another Minolta 28mm F2 on the cheap and swap out the front glass element for a non-scratched one and not have to think about this issue again.
I might eventually sell my whole Minolta Maxxum/Dynax 7 set and go back to medium/large format film. I now have all the original boxes, paperwork, inserts, etc. to all my Minolta gear, including my other Minolta Maxxum prime lenses. If I sell the whole set, I'll of course mention the issue with the Minolta 28 F2 lens. Nonetheless, considering that literally everything looks like it's brand new, save of course for the fronts lens element on the 28mm F2, I suspect that I might get a decent penny for the whole set with a buyer who is completely fine with it.
You guys have been incredibly helpful and supportive despite my venting and making mountains out of molehills. (My apologies again.) No wonder I'm so fond of this community.
Now it's time to enjoy this lens and figure out if I should get the Minolta 35mm F2 or the Sigma 35mm F1.4 HSM Art to round my set out!