Save your money on this one.
In my mind, there is a lot of conjecture in the description and interpretation of this photo. No photographer, no date, no place of where photo was taken, no reference whether photo has ever been published, no provenance, etc, etc. The photo's association with the steamer Alice Price is alluded to, but again no proof of any sort is offered. To command a premium price such as 11k there should be much, much more tangible evidence that the photo is what it is claimed to be.
If I owned the tintype and offered it to you for let's say $25 claiming it is a "Civil War era photo depicting four men in a farm wagon" how would you go about proving elsewise to someone who intends to buy that it is indeed Union, Confederate, Navy, prisoners, and all the myriad of other "details" this sale has listed?!?