I've ordered a pile of them from J&L over the past few years.
Suggestions:
Fox Labs units are slightly overfilled when they are initially loaded and then each is individually tested.
So Don't test them.
They will work when you need them.
Part of what you are paying for when you buy them is that they already are pre-tested to work.
You'll just be wasting product if you test them.
Also the way they are shipped from J&L you might need to slide the top lever over to "SAFE" and then carefully push the bottom of the cannisters all the way up into the case the last 1/8" or so.
Also make sure the bottom cap is snapped in
hard all the way after you get your keys on the ring.
Glad that you bought extras.
I sure have given a lot of them away to friends and family that won't carry a firearm for one reason or another.
My logic being that
something is always better than nothing.