The openers are included in the CRATE that the two ammo cans come in...just buy a crate and you get the opener. You can also use a dremel tool or cutoff wheel in a drill to open them.
I guess on of my old hobbys, restoring cars, has help me here. Like changing a door skin. I lay the can upside down and with a small hammer and chizell, gently tap and pry the lid all the way around the can. I have been able to remove the lid in such a manner I can reuse it. Takes patience.
I once tried to find a can opener and seems everyone was sold out.
Wow 45 minutes with tin snips and no need for stitches
Granted the metal spam can is fubar'd. A steel toothed wolverine coulda been blamed. The store I got it at stated they couldn't sell the openers, and all 4 gun shops in my area could not suggest where to find them. I searched over 35 can opener sites and 70 some odd mil surplus sights but as usual you people came through for me, A VERY BIG THANK YOU to my forum pals.