I've just seen this post on another airgun forum:

i`ve been involved in the selling of Frank`s collection. They`re sold to different people. On the Dutch airgunforum there has been a topic in wich his guns have been sold. One of Frank`s friend has sold a lot of `m. Next er rto that they`re being sold on the internet on some second hand site. For as far as i k ow now most of `m are sold now.