I don't tend to hunt a large amount of nickels but do so between my half dollar batches. I'm not an error collector so I mostly pull out uncirculated and lower mintage coins (pre 1960 and 2009's) but will grab any major errors I see. This week I was able to obtain $150 in CWR nickels that included some older looking rolls. I was able to pull out 5 complete rolls of BU nickels dating from the 80's and 90's with some being pretty gem. I have to go back through them again as there were a number of them with full steps. A few from the 60's and 70's also made the cut. Here is a sample of them. I was able to pull out another 2 complete rolls of BU's from the following dating from the 90's and 2000's with other dates sprinkled in. Other finds were ~20 pre-1960 coins none being a key date, 4 Canadian nickels, a 20 Rappen, and 1 Bahamian nickel.
Pretty much any bank I've gone to is willing to give out CWR's. I just happen to catch one with a large amount on hand. Typically they are in lower amounts.
BU is a term sellers, not all of them, use to sell coins. BU is not a grade or condition of the coin, it's a marketing term that has become way to common.
I was a kid but I remember that. Now a days dealers use the term zinc loosely as the MS numbers have a better usage in today's coins than in the sixties.
I once was into searching rolls of nickels. I now have about $800 worth sitting in coffee cans. One of these days I'll take them to the bank but man they are heavy!