Answer a few questions....
87's... 1987 P&Ds were not sent out for circulation, only sent out in mint sets so keep the ones you find. Same with the 2002's and newer. According to the Red book, the 2001P's were also not released but I seem to find quite a few of those... I have yet to find an 87 or a 70.
Fed boxes... the flat boxes with 50 rolls in white and yellow wrappers are the fed boxes that banks order from the federal reserve.
"S" mint... these are the Proofs out of SanFransisco mint. There somewhat easy to spot because they are minted witha greater detail and the kennedy head and eagle on the back have a more satin finish with the background in a higher shine than circulated. Proofs are uncirculated but uncirculateds are not all proofs.