A few quick thoughts here. First, as far as binoculars go, ALWAYS be wary of ANYTHING high value, used, offered on the bay. Most of the sellers are clueless and what they tell you about condition is ALWAYS suspect. I would take the serial number and call Zeiss with it. The last thing you need is a gray market or stolen item on your hands. The status of the binocular should be revealed by the number. If it checks out, then if it were me, after saying the above, I'd hit the buy it now button. Those viewing this binocular are hoping somebody will bid it low, and they will be able to snag it on an even better deal. The price is already low enough to be at least partially suspect, don't get greedy...provided the serial number checks out. Ask specifically what happens if you need to send it for service. Save the listing page, particularly the picture with the serial number, in case you do buy it and the serial number on the one you get does not match the listing.
Allbinos reviews should always be suspect. Two reasons for that. One is they never seem to take the effort to determine if their sample specimen is damaged or out of spec in some way. Second it it is impossible to assign subjective performance values for various parameters and then use those to to assign objective performance number particulars. No amount of anecdotal observations will ever amount to a data set. Aside from that, they do have a lot of good information, but it is often not easy for a newcomer to sort the wheat from the chaff.
Different people see things differently but the Swarovski CL is NOT significantly better than the 8x32 Meostar. Neither is it immediately apparent it is any better than the Maven B 3. The B3 is something the OP needs to look at as well.