It is not uncommon for memorabilia to be sold and resold within a short period of time, so this listing doesn't surprise me. On the other hand, I would be surprised if it hit a large enough value to cover the cost associated with selling through a major auction house. That nearly $5k price was a very impressive number a year ago.
Anyway, since SCP's auction description is severely lacking compared to Legendary's previous auction description I thought I would elaborate further. The Christmas card includes a personal note from Jackie to Gil that touches upon the business side of Baseball. Jackie clearly expresses a high level of dismay at being traded to the Giants. Here is what it says:
"Dear Gil, It has been a pleasure being a teammate all these years. I hope you have continued success through the years. We expect the day but when it comes it still (is) shock but that's baseball. I hope it never comes to you. Give my best to the family.If I had the excess dough I would be a bidder for this. Unfortunately, discretionary income is a little bit lacking. Go to my original post from last year for even better photos of the Christmas card.
Sincerely, Jackie Robinson"