I don't sort through a lot of nickel boxes. Unlike the enormous quantities of dime and half dollar boxes I've cycled through since 2009, the number of nickel boxes is small, although still significant. I'll guess ~100 boxes. In all those boxes, never found the 1950-D.
On 6/25/2011 I found my first and it came in pocket change no less. Got it at the neighborhood Speedway gas station/convenience store. It was nice and looked like it has just dropped into circulation -- high AU or maybe even yet a low MS coin.
Fast forward.
Today -- 6/6/2015. Got my 2nd!!! Can't say for sure where it came from, could have been either the CVS or I made stops at the bank and credit union. This one has been out there a little longer, but still nice. Perhaps a low AU coin.
I'm 43 and looked for that coin throughout my childhood and most if not all of my adult life (always checked my pocket change). Now two in the space of four years, both from pocket change, not heavy roll hunting.
Just amazes me.
Jeff