I just checked out his posts. Looks fairly legit. I couldn’t tell where he was located, maybe PA? If you were close enough to go and pick up the parts personally, I wouldn’t have much reservation. Buying sight-unseen is a risk, of course, and somewhat dependent on the payment method. No recourse for getting shafted on Instagram. He has enough activity, though, that if it’s a scam, it’s a dedicated one.