There is no 1996 Wide AM, and it's websites like internet people perpetuating the myth of it's existence. There are none that have been authenticated or come up for sale to prove it exists. (i was blocked from posting the names of those I was gonna name for perpetuating the myth of the 1996 WAM
and had to remove them to post.........)
This may help, there are charts online also. this is in order of hard to easiest (rarest to least rare)
1. 1992 Close AM - extremely rare
2. 1992-D Close AM
3. 1998 S Close AM (Proof Set issued)
4. 1999 S Close AM (Proof Set issued)
5. 1999 Wide AM
6. 1998 Wide AM
7. 2000 Wide AM - least rare
Now I would say the 2000 is the easiest to find, and it's still hard, I've only found a half dozen maybe since 2000. next is the 1998, I've only found 2 since then.
I've never found any of the others, and I checked about 100 proof sets of 1998 and 1999 also, whenever I stop at a coin store somewhere or show, hoping I find something someone missed. never found the 1999 WAM
or the 1992 CAMS. All are hard and it takes a lot of searching, but the 2000 is the easiest, followed by the 1998.
Yes finding the 1998S or 1999S CAM
in a proofset is just a little harder than finding a 1999 WAM
they are ranked in difficulty.
Are you wasting your time? No. you will eventually find 2000 and 1998. it will be hard to find 1999, and either of the 1992s.
You may find the proof set CAMs if you spend the time scouring dealer inventory in person, or watching ebay and hoping for good pictures that reveal it yet the seller doesn't know about it.
(might be able to cherry pick the 1998S or 1999S CAM
if you are doing it to get rich, you'd be wasting your time though. if you find one it's going to be the common ones that are a couple dollars tops, if you happen to find a 1992, it's likely going to have condition issues that hold it back from top dollar considerably, but still finding a 1992 close AM is going to be like getting hit by lightning in any condition.