It's part of evidence collected in the Epstein/Maxwell files that the DOJ has possession of....from what I have read. Hopefully Trump's FBI Director doesn't corruptly make it disappear, for Trump....

. though I'm pretty confident that there is likely duplicate files or photos somewhere, to make certain it did not just disappear....but who really knows?
Murdoch, the owner of the wall street journal, (and Fox News, and the New York Post) would NOT have published the article on the strange birthday wish card from Trump, if he believed it was fake and could lose big in a defamation suit....his ass is still a burning inferno from the $780 million dollar settlement Murdoch had to pay Dominion for Fox spreading lies about the election being stolen in 2020....and knowing it was all lies.
There is no question in my mind that Murdoch and the Wall Street Journal believe the card from Trump is real...they believe they will win in a court of law and Trump's defamation suit will fail.... I don't think they would let themselves be tricked....