If what you report is correct apparently the story is true and the Truman paperweight has been moved to the writing desk in the Lincoln bedroom.
THIS IS WORTH LOOKING INTO
I did a little research and it would seem that paperweight hasn’t been on the desk in the Oval Office since Truman had it there. Apparently the reverse side says “I’m from Missouri”. Anyway I think it is in the Truman Library.
WhiteHouseMuseum.org has photos of the oval office desks going way back and each President had their own memorabilia if any.