Sorry for the late reply, but it required me fishing back through my old sell threads.
I'm not at all sure about the Aureate, so I won't even try.
As for the no-req r8 Sun and Moon ...
Last October, I sold these two (copied from the old thread) ...
# sold a purple, no req. insc. 8ar Sharktooth Shield for 25k - Thanks!
# sold a blue, no req. insc. 8ar Ornate Buckler for 20k - Thanks!
Stuey bought the Ornate Buckler, so you just know I probably sold it too cheap.
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I think he told me later that he'd sold similar shields for ~50k, but take that with a grain of salt. It's many months old now and me working from memory. Seeing as Sun and Moon is probably more rare and popular than Ornate Buckler, I'll guess yours is reasonably at least ~35-50k. I'm not sure what the market for these is like these days with all the demand for the low Tactics req shields.
I'm pretty sure you get 8 armor from any shield if you don't meet the req., but that has never seemed to stop folks from liking these no-req. ones. They certainly are not easy to find when you want one.
Cheers & GL!