At first I kept them all, but then I realized that they just aren't uncommon to find, and even more uncommon to sell for profit. I kept 2-3 of each year/mintmark and recirculated the rest. I figure I would have over $1000 worth of NIFC had I continued to keep them. I still keep any proofs, so long as they are in really good shape. Might have 50 of those. Eventually, I'll throw them on ebay at a minimum bid that I deem enough of a profit to make it worthwhile, and if someone bites, I'll sell them. Just like Boris posted above, I have also kept every 1987 that I have found. I have absolutely no idea why I won't even give another 2002-11 half a second glance, but will toss a 1987 into the "keeper for now" pile. I guess because its older??

These will likely either end up on ebay as well and recirculated if they don't sell.