I also was going to suggest maybe an auction if you really just want them gone
about 3 yrs ago, I went to an auction for an estate that the previous owner was a huge life time hunter, had a custom built 40x120 ft building built just for all his mounts, and it was STUFFED full, he had elephants on down, tigers lions and bears and you name it, he hunted it and had most all full sized mounts on things, put my local cabela's to shame with what all he had!
the amount of $$ he must have spent on hunts, and mounts,
was un real!
when I first got there, I couldnlt believe he had so many mounts!
Oddly, there wasn't a single gun for there at the auction, ??
I really had no interest in buying any, but I stuck a round to see what some of the things went for!
he had 10 different full sized grizzly/brown bears and even a Polar bear!(which wasn't able to sell due to some permit or something wasn't ready yet!) and about 6-7 black bears
but the Brown bears, some standing, some on all 4's, went any where from 750 bucks(I was tempted to buy one at that price) to about 4500, and they came with a written documented story in a leather binder, telling of the hunt, which I thought was super cool!
I didnl;t stick around to see what all the African game animals went for
but nothing I seen go off at this auction went for very much
I am sure the man that shot everything would NOT have been happy seeing his things go for so cheap, I'm almost sure he would have rather-ed trash them to see things he obviously loved and was passionate about, be sold so cheaply!
but after talking to a few of his family members there, they had ZERO interest in them, and just wanted them GONE, ,!
to me that was sad to hear, as its a shame what happen's some times when we pass away with our beloved items!
BUT sounds like this deal here the owner is still alive, and as such, MAYBE might want to adjust some prices, or try an auction to sell them , if they too just want them gone!
you can also try putting add's in local news papers, or possibly online add sites like craigslist or face book market place
just be aware that in SOME states it ILLEGAL to sell game animal or PARTS< and some times that means MOUNTS too!
Local bars , are also worth stopping in and asking if hey have interest, all the more so when you get into more rural area's
if seller has desire to do so!