There might be a market among classic computer collectors.
Your pictures doesn't show how big these drives really are. Here is a good page about them.
http://www.hpmuseum.net/display_item.php?hw=390
On that page there is a webpage to visit if you want to buy a drive, maybe you could call and ask if they are interested.
http://www.comco-inc.com/we-buy-drives-a9.html
There are two up for sale on ebay at the moment, but if they will sell is another question.
https://www.ebay.com/itm/HP-7980XC-tape-drive-6250-1600-BPI-9-track-tape-drive-refurbished-/252436648771
This is another place where you could find a customer if you are lucky.
http://www.vcfed.org/forum/forumdisplay.php?7-Marketplace
How much do you want for a drive to make it worth selling instead of scrapping it? No, I'm not going to buy one, it's too heavy to ship to Sweden. If I was in a neighboring town maybe... :wink:
Göran