I've pulled out a substantial number wheaties that I stuffed away in the early to mid 60s. I wish I had been a better custodian of them as about 20% have succumbed to verdigris. I do have however over a thousand 1946-S that I've yet to inspect for the S/D OMM. I'll be posting images here to get the community's opinion as to authentication. Thanks and hope I'm not a bother ;-)
https://www.amazon.com/gp/product/B08CSFVFLX/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1 The only drawback to this type (many offer similar scopes) is that you can't view/image the entire coin within its limits of field. If they would extend their adjustment rail another 5 inches that would do it. I can image an entire coin but have to juryrig it to do so.
Welcome Grae, One thing to remember about the S MM. The S MM is notorious for small die chips. It wears and deteriorates very easily. This causes the die to chip off and create what looks like an RPM or OMM at times. This is not just on the 46' it has happened to all S' MM thru the years. The two you have posted look like die chips. If you find one that has separation. Meaning that the D is outside the area, you could have something.
You can confirm the attribution by looking for the markers for a coin in the various die states you might find it in. Placement is the first thing to look for, then look for other diagnostics. Good luck with that pile!!
I see what your talking about, but that might just be a die crack. Look on variety Vista to compare to ones they have on there. Check for the markers and whatnot. And then post it with the proof/markers.