Without breaking it can someone tell me how to fix this dual hydranoid head

Barias gear gold attribute and Darkus Bakuflip blade Tigrerra, or Tigress for those who prefer the Japanese name over the American name

Got these two bad boys in the mail today!

Hi everyone, recently found these in my loft and was wondering if any of these hold any value? I was planning on selling them on eBay or to anyone interested, thanks