Upon Further Review....

To my fellow collectors, have any of you ever found a card in your common/tradeable/undesirable boxes that you never realized you owned.  Well, today it happened to me.
Several months ago I bought one of the repack of packs at Target.  One of those packages of various older packs of cards for like $10-12 dollars.   I  remember this one in particular had a 2009 OPC, 2011 Topps Lineage and 2008 Upper Deck Piece of History along with others. 
I was going through one of my common boxes and found this gem:

Evidently I pulled a Joe Mauer jersey card out of the UD Piece of History.  In my defense,  the jersey is kinda small and hidden compared to the box score on the card.
This has happened to me before. Years ago, I bought a box of 2001 Upper Deck Legends of NY at discount at one of those big box retail stores.  The box promised good odds for a jersey or autograph card.  I thought I purchased a dud of box, but months (maybe even a year or so) later I discovered I had a Carl Erskine jersey card.  Now I consider I own a little piece of Dem Bums of Brooklyn with my Erskine jersey card:

I guess I should pay more attention what I have when I open packs.

Trading on the Web

I got some cards back from http://swingandapopupboston.blogspot.com/.  Here is some of the baseball card portion of the cards I received. A couple vintage rookies of minor stars of the past:

Various cards for my last year collection:

plus one more of a recent retiree:

Thanks for the trade. Hope to do again.