They don't - I spent a very enjoyable afternoon some time ago updating the ZTL listings and making them fully accurate after I was provided with a then-current stocklist by someone with ZIMS access, was thanked by the ZTL admins, only to be scolded by the ZTL admins several days later after Walsrode complained to them that an accurate stocklist was visible to the public

cue all my work being reverted and the listings being actively made inaccurate (including moving species back into current holdings which had left the collection years before).
So I think we can be fairly certain that Walsrode would be loathe to publish a stocklist anytime soon given said reaction