In Supreme Victors I would trade the box. I think there's someone here on the trading forum that would trade an Uxie X for it, I think it's Torterra_tank but not 100% sure.
A lot of the pulls from the set came out in the tins, and the best Lv X in there is Blaziken which pulls in $13-15. Assuming you get a good box and get Absol and Blaziken, that won't cover much. It also doesn't have that many marketable uncommons.. Garchomp C is the best one, as well as Palmer's, but still not worth enough to open it.
I also wouldn't necessarily resell; at least not on ebay. Remember that eBay takes 9% of what you get from it, paypal takes $.30+2.29% of the value, and it'll cost you at least $5 to ship.