I must be one of the DREAMERS since I inquired about the 10.5 box. To spell out the possible problems---how many miles on it? How was it driven? How long has it been stored? Where was it stored? What climate was it stored in? Was it stored sitting up right or on the bottom cover? How much gear lube is in it? Is the gear lube original? Was the bottom cover ever removed to inspect the ring gear for any rust? Was it ever pressure washed?
Now if the synchro clearances are low, the gear cones wear out as fast as the synchros on the type 2 so depending upon the clearances, the cone and synchro on every bad gear will need replaced and the only way to check this is to disassemble the box. It will shift fine with only .005 synchro clearance but obviously not for long. There are many other things inside a used trans-axle that can be listed but I think you all get the point.
10.5 is not out of range for a totally checked and documented or properly rebuilt pre 10,000 case type 2. It may be fine as is BUT if not???
Now a basket case with a bad input shaft for 10K plus shipping to the US would not be a cigar lighting deal IMHO.
I do hope you both get what you are asking and the buyers get what they need and expect, good luck with your sales.