Avoid the 168.029 - while the 18k white gold fluted bezel and the structured linen dial are generally nice features, this one shows what might be water damage to the dial. Right half is discolored, which will not clean up. Indices also show degradation from that, and there’s corrosion in the movement (regulator, screws of the case clamps). Not sure if the box has anything to do with this model, but that’s only a side not really. Seller fails to mention any of the flaws in the description, not the guy I’d wanna buy from.
The first one looks much better, but there are more pictures needed. From the sides and the inside, most of all. A similar (or even identical) configuration was offered here a few days ago as serviced for 700€ shipped.
Generally, these are relatively common refs, so if you put “Omega 168.029” (or any other ref of interest) in the eBay search and limit it to “sold articles” you’ll find what they’ve sold for in the last few month. Your best tool to find prices - maybe combined with the forum search here.