I tether my ammo cans with 1/8" steel cable, but loop it through an eyebolt attached to the can, not just through the handle or that flimsy wire hoop thing. I've only lost one that was secured like that, and on it, the cable had rusted so badly after being submerged during Ike that the thieves were able to break it off at the attach point.
I saw one of your caches done that way and considered doing it but now you have another chance for the can to leak. I decided anyone who wants the can bad enough won't want to screw up the handle to the point it's unusable. The fact this person went to the trouble to cut the cable sorta supports that. It's possible the cable I used was stainless cause it was as shinny as the day I put it out in February two years ago.
I drill a hole in the can, put an eyebolt through it with washers and nuts on both sides and epoxy the hell out of everything with JB Weld. That seals it and pretty much prevents anyone from just unscrewing the nuts. A couple of ammo cans rode out Hurrican Ike, floating by the end of the cable in the water column of the 14' storm surge and didn't leak a drop. It takes cable cutters to cut the cable -- you can't just bring lineman's pliers or side-cutters. I had one where someone brought cable cutters, cut the cable cleanly but left the can sitting right there. Weird.
In 8 years, I think I've lost 8 or 9 ammo cans to a combination of muggles, bulldozers and hurricanes. Only one of those was tethered.
Edited by HoustonControl, 23 April 2013 - 02:05 PM.